{"title":"2025.9.24 About Green Zircon","description":"\u003cp\u003eGood morning!\u003c\/p\u003e\n\u003cp\u003eIt's Nori-chan.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cstrong\u003eThis installment of the \"5-Minute Read Time-Killer Series\"\u003c\/strong\u003e is about \"Green Zircon.\"\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003cbr\u003e　In this content, I'd like to briefly explain zircon in general.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e　The image below shows zircons of various colors, such as the deep blue \"Ratanakiri Blue\" and purple zircon.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_20250923_085349_2_480x480.jpg?v=1758585446\"\u003e\u003c\/div\u003e\n\u003cp\u003e　Zircon, known in Japanese as \u003cstrong\u003eHyacinth (風信子石)\u003c\/strong\u003e, is a mineral belonging to the silicate group. It is widely distributed in rocks, regardless of size, but the sources of gem-quality zircon are somewhat limited.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e　Have you seen it in some article? You might hear \"the oldest mineral in the world~,\" but this refers to Australian zircon and does not apply to all zircons.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e　\u003cspan style=\"text-decoration: underline;\"\u003eIt has a relatively high Mohs hardness of 7.5, and its specific gravity is comparable to or slightly heavier than sapphire \u003cstrong\u003e(more on this later)\u003c\/strong\u003e\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003eAs its name suggests, zircon is a mineral containing zirconium (Zr), but there is also a red variety called hafnon, where zirconium is replaced by hafnium (Hf).\u003c\/p\u003e\n\u003cp\u003eSince they are relatively similar, elemental substitution is possible.\u003c\/p\u003e\n\u003cp\u003ePerhaps that red zircon you have might actually be hafnon, mineralogically speaking.\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e　The photo below shows the \u003cstrong\u003e\"doubling effect\"\u003c\/strong\u003e that will be discussed in the next section. The facets on the crown side are clear, but the lines of the back facets are blurry. This is \u003cspan style=\"text-decoration: underline;\"\u003enot due to poor faceting technique, but rather an optical phenomenon\u003c\/span\u003e.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_20250923_090119_2_480x480.jpg?v=1758585941\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e　One of zircon's characteristics, along with its history as a diamond substitute, is the \u003cstrong\u003e\"doubling effect.\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003eThis is a phenomenon where \u003cspan style=\"text-decoration: underline;\"\u003ethe facets on the pavilion side appear double due to birefringence\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003eThis effect, like in sphene, combined with its inherent strong brilliance, makes it appear even more dazzling, creating a truly brilliant sparkle.\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e　The image below is a zircon that is a prime example of the next topic, \u003cstrong\u003e\"metamictization.\"\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003eAlthough the \u003cspan style=\"text-decoration: underline;\"\u003erefractive index itself is much higher than ordinary minerals even with advanced metamictization\u003c\/span\u003e, after seeing a typical heated zircon, it appears several steps less brilliant.\u003c\/p\u003e\n\u003cp\u003eThe doubling effect is also weaker.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003cimg style=\"float: none;\" alt=\"\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_20250923_091032_2_480x480.jpg?v=1758586561\"\u003e\u003cbr\u003e\u003cbr\u003e　Zircon undergoes \u003cstrong\u003emetamictization\u003c\/strong\u003e because it contains trace amounts of radioactive elements.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003eIn simple terms, metamictization is \u003cspan style=\"text-decoration: underline;\"\u003ethe damage to the mineral caused by the encapsulated radioactive substances themselves\u003c\/span\u003e.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003eThe \u003cstrong\u003ebeauty, hardness, and specific gravity of zircon are affected by the degree of this progression\u003c\/strong\u003e. (Metamictization tends to make it more brittle and lighter than the Mohs hardness and specific gravity mentioned earlier.) Green zircon is particularly susceptible.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e　Within zirconium itself, there are radioactive isotopes that are radioactive zirconium.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003eHowever, this is not usually the cause; rather, it's typically due to \u003cspan style=\"text-decoration: underline;\"\u003eother radioactive substances (such as tritium, uranium, etc.) contained within the zirconium mineral\u003c\/span\u003e.\u003cbr\u003e\u003cbr\u003e　The process used to somewhat repair this metamictization, and also to improve the color itself, is \u003cstrong\u003e\"heat treatment.\"\u003c\/strong\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003eThis allows for the partial restoration of damaged atomic arrangements, making the crystal more beautiful.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003cbr\u003e\u003cbr\u003e　The image below shows zircons that have undergone \u003cstrong\u003e\"heat treatment\"\u003c\/strong\u003e, which will be discussed in the next section. They exhibit beautiful brilliance and varying hues. The method of heating can also cause differences in color.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\n\u003cbr\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_20250923_092140_2_480x480.jpg?v=1758587085\"\u003e\u003cbr\u003e\u003cbr\u003e　\u003cspan style=\"text-decoration: underline;\"\u003eIt can be turned blue at 800-1000 degrees Celsius, and colorless at higher temperatures\u003c\/span\u003e.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003ePure crystals are colorless, but it's generally safe to assume they've been heat-treated.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003eAlso, \u003cspan style=\"text-decoration: underline;\"\u003enot all stones turn blue or colorless\u003c\/span\u003e, nor do all of them exhibit beautiful hues.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003eIt depends on the stone's inherent potential and origin.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e　This heat treatment, similar to the heat treatment applied to corundum and the impregnation treatment applied to emeralds and red beryls, \u003cspan style=\"text-decoration: underline;\"\u003eis not considered a value-detracting treatment\u003c\/span\u003e.\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cbr\u003e\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003eEspecially, unlike corundum heating, there is almost no price difference between heated and unheated; rather, if a beautiful color is produced, the value increases.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e　The image below shows a blue zircon with high-type characteristics and a low-type green zircon where doubling is not visible, which is important for visual identification in the next section, \u003cstrong\u003e\"Types.\"\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\n\u003c\/div\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_20250923_121117_2_480x480.jpg?v=1758597352\" alt=\"\" style=\"float: none;\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e　Zircon is generally divided into roughly three stages—\u003cspan style=\"text-decoration: underline;\"\u003e\u003cstrong\u003elow-type, intermediate, and high-type\u003c\/strong\u003e—based on the progression of metamictization\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003eMetamictization is the long-term, slow destruction of the structure by radioactive elements, and as it \u003cspan style=\"text-decoration: underline;\"\u003eprogresses, its mineralogical and optical values also change\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003eThere isn't a strict definition (though there are established numerical values for each), but heat treatment causes the crystal structure to recover, resulting in a high-type, while green zircon is generally considered a low-type.\u003c\/p\u003e\n\u003cp\u003eRadioactive minerals containing radioactive elements often exhibit green, brown, or black colors.\u003cbr\u003e\u003cbr\u003eMainly, \u003cspan style=\"text-decoration: underline;\"\u003estones with high optical values during gemological examination are classified as high-type\u003c\/span\u003e, so it would be a case of \"\u003cstrong\u003eexamination → numerical type classification\u003c\/strong\u003e.\"\u003cbr\u003e\u003cbr\u003eIt's not a very simple distinction, but try looking at your zircon with a loupe or similar tool. The intensity of doubling is one indicator.\u003c\/p\u003e\n\u003cp\u003eAnd not all green zircons are low-type; intermediate and, rarely, high-type specimens also exist.\u003c\/p\u003e\n\u003cp\u003eAn \u003cstrong\u003einteresting anecdote\u003c\/strong\u003e is that \u003cspan style=\"text-decoration: underline;\"\u003esince heating causes changes in color and type, low-type green zircons are often heated to improve their gem quality\u003c\/span\u003e, which makes \u003cstrong\u003egreen zircon a rare color category\u003c\/strong\u003e.\u003cbr\u003e\u003cbr\u003eA similar story applies to \u003cstrong\u003ezosite (tanzanite)\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eLow-value colors of zoisite, such as brown, are heated to transform them into tanzanite, increasing their value. Thus, there is a paradox where a low-value color becomes a rare color.\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e　The image below shows the \u003cstrong\u003e3.649ct green zircon featured this time\u003c\/strong\u003e.\u003c\/p\u003e\n\u003cp\u003eIt has good brilliance and color, and is believed to be an intermediate type.\u003c\/p\u003e\n\u003cdiv style=\"text-align: left;\"\u003e\u003cimg style=\"margin-bottom: 16px; float: none;\" src=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/Screenshot_20250923_083203_jp.naver.line.android_2_480x480.jpg?v=1758584083\"\u003e\u003c\/div\u003e\n\u003cp\u003e\u003cbr\u003e　The green zircon we are mainly introducing this time is unheated.\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"text-decoration: underline;\"\u003eUnheated green zircon, in particular, often has a relatively advanced degree of weathering due to metamictization, which negatively affects its brilliance\u003c\/span\u003e.\u003c\/p\u003e\n\u003cp\u003eAlso, although there are individual differences, I've heard that unheated green zircon is generally very difficult to cut and polish.\u003c\/p\u003e\n\u003cp\u003eHowever, the piece we are introducing this time is a rare gem with \u003cstrong\u003estrong brilliance, good color and hue, and a beautifully finished cut\u003c\/strong\u003e.\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 1rem;\"\u003e　This time too, we are featuring zircon, so please enjoy its sparkle firsthand.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003eIt is with sparkling minerals like these that good cuts bring out an overflowing brilliance.\u003c\/p\u003e\n\u003cp\u003eYou can definitely enjoy it in your room, in the sunlight, or even when you're out and about.\u003c\/p\u003e","products":[{"product_id":"yellowish-green-zircon-1-113ct-sri-lanka","title":"Yellowish Green Zircon 1.113ct \/ Sri Lanka","description":"\u003cp\u003eYellowish Green Zircon 1.113ct\u003c\/p\u003e\n\u003cp\u003e5.39×7.89×3.08mm\u003c\/p\u003e\n\u003cp\u003eProduct of Sri Lanka\u003c\/p\u003e\n\u003cp\u003ePear Shape \/ Cube Cut\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eCut by Pia\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \/ \u003c\/span\u003e\u003cspan class=\"s1\"\u003ePu\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \/ \u003c\/span\u003e\u003cspan class=\"s1\"\u003eTen\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eComes with Sorting (Simple Identification Report)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e¥64,800-\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA yellowish-green zircon from Sri Lanka, where refreshing yellows and greens blend together.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis pear-shaped piece features a unique \"cube cut\" on the crown, creating a distinctive sparkle where box-shaped motifs emerge in the reflection of light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis highly difficult cut design, which varies the size of the boxes, maximizes the transparency and dispersion of the zircon.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe pavilion side is combined with a precise step cut, and the linear sparkle and playful crown cut intertwine, spreading a colorful and sharp brilliance characteristic of zircon.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhile slightly thinner, the cube cut without a table minimizes light leakage, and as the angle changes, a deep light emerges.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTwo relatively large layered inclusions are visible internally, but they are not noticeable to the naked eye amidst the translucent texture of the crystal and the sparkle of light, instead adding character typical of a natural stone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eOverall, it has a subtle silky quality yet high transparency, and you can enjoy the iridescent fire due to the high dispersion unique to zircon.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGreen zircons are difficult to polish, and while they are available in the market, beautifully polished ones are rare.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis particular piece is a special stone that had been in stock for a long time, finished at a time when the polishing experts Pu-chan and Ten-chan were involved in GTJ's work after a long absence.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease enjoy the original cut work floating on the pear shape and the beauty of its greenish-gold color with your own eyes.\u003c\/span\u003e\u003c\/p\u003e","brand":"GemTreeJapan","offers":[{"title":"Default Title","offer_id":49532022620353,"sku":null,"price":64800.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_4355_cf03977d-ae39-4552-87fd-574b73d3cf2f.png?v=1757490645"},{"product_id":"green-zircon-3-649-madagascar","title":"Green Zircon 3.649ct \/ Madagascar","description":"\u003cp\u003eGreen Zircon 3.649ct\u003c\/p\u003e\n\u003cp\u003e7.14×9.88×5.45mm\u003c\/p\u003e\n\u003cp\u003eProduct of Madagascar\u003c\/p\u003e\n\u003cp\u003eOval\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\"Pi\" and \"Pu\" Collection\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003eIncludes sorting (EGL simplified identification report)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e¥450,000-\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhile many green zircons have strong, subdued colors, this is a rare Madagascan crystal that combines brightness and vividness.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt is a masterpiece finished in a prominent oval shape of over 3.5 carats.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 1rem;\"\u003e\u003cspan\u003eGreen zircons that have not undergone heat treatment differ in properties from other zircons and are known for their high difficulty in cutting and polishing.\u003c\/span\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 1rem;\"\u003eIn this piece, Pi-chan shaped the outline and Pu-chan spent a full day polishing, completing this exquisite item by carefully adjusting the polishing speed and other techniques.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrom a deep green, fine sparkles of bright green emerge, creating an impression much like a high-quality green tourmaline.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurthermore, the zircon's characteristic powerful fire flashes vividly from time to time.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAlthough there are minute inclusions, they are almost imperceptible to the naked eye, and the crystal's transparency is extremely high.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAmong green zircons, pieces with beautiful cuts are rare, and such vivid and transparent stones as this one are exceptionally unusual.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis is a beautiful 3.5+ carat crystal with exceptional color, created by GTJ pouring endless time and skill into its finish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease enjoy this brilliance in your hands.\u003c\/span\u003e\u003c\/p\u003e","brand":"GemTreeJapan","offers":[{"title":"Default Title","offer_id":49555330072769,"sku":null,"price":450000.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_6283.png?v=1758589459"},{"product_id":"green-zircon-2-59ct-sri-lanka","title":"Green Zircon 2.599ct \/ Sri Lanka","description":"\u003cp\u003eGreen Zircon 2.599ct\u003c\/p\u003e\n\u003cp\u003e6.29×7.97×5.22mm\u003c\/p\u003e\n\u003cp\u003eProduct of Sri Lanka\u003c\/p\u003e\n\u003cp\u003eCushion\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003ePiachan\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \/ \u003c\/span\u003e\u003cspan class=\"s1\"\u003ePuchan\u003c\/span\u003e\u003cspan class=\"s2\"\u003e Piece\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003eComes with a sorting certificate (EGL simple appraisal report)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e￥180,000-\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAmong green zircons, which often have deep colors, this crystal from Sri Lanka possesses a silky softness, transparency, and a vibrant yellow-green hue.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIt is a piece crafted into an impressive cushion shape, weighing over 2.5 carats.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUnheated green zircons have different properties from other zircons, and are known for often having individuals that are extremely difficult to cut and polish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn this piece, Piachan shaped the outline, and Puchan and Piachan each polished one side.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis is a unique piece, brought to completion through delicate adjustments such as reducing the rotational speed.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrom the uniform silkiness that envelops the whole, a bright green sparkle emerges with a soft luster, and occasionally the powerful fire characteristic of zircon flashes vividly.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA faint brown inclusion floats in the pavilion, but it is hardly noticeable to the naked eye and rather adds to the depth of the crystal.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFrom certain angles, multiple growth lines appear layered within the crystal, giving a complex nuance to its sparkle and highlighting the soft, rich brilliance unique to the cushion cut.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eDue to the silky quality of the stone, the yellow or green can become stronger depending on the time of day and light source, and the stronger the light, the bluer it becomes, showcasing a rich array of expressions.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGreen zircons, which combine beautiful cut and silky color, are highly sought after and rare.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan style=\"font-size: 1rem;\"\u003eA beautiful crystal of over 2.5 carats, meticulously finished by GTJ.\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease enjoy its unique brilliance in person.\u003c\/span\u003e\u003c\/p\u003e","brand":"GemTreeJapan","offers":[{"title":"Default Title","offer_id":49555601490113,"sku":null,"price":180000.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_6428_0727ba0f-aa6b-4c42-bf85-93b7945d3586.png?v=1758702402"},{"product_id":"greenish-yellow-zircon-1-283ct-sri-lanka","title":"Greenish Yellow Zircon 1.283ct \/ Sri Lanka","description":"\u003cp\u003eGreenish Yellow Zircon 1.283ct\u003c\/p\u003e\n\u003cp\u003e5.00×6.47×3.95mm\u003c\/p\u003e\n\u003cp\u003eProduct of Sri Lanka\u003c\/p\u003e\n\u003cp\u003eOval\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003ePiatt\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \/ \u003c\/span\u003e\u003cspan class=\"s1\"\u003ePup\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003eCollection\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003eComes with Sorting (EGL Simple Appraisal)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e￥81,000-\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis Sri Lankan zircon boasts an impressive bright and vivid greenish-yellow hue, reminiscent of chrysoberyl.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUtilizing the silky quality of the crystal, this piece is crafted into an oval shape meticulously adorned with a flower cut.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eUnheated green zircons differ in nature from other zircons and are known for being particularly difficult to cut and polish.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis particular piece is a one-of-a-kind creation, brought to completion by GTJ's main cutter, Piatt-chan, through delicate adjustments such as reducing rotation speed. The skilled craftsmanship truly shines.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe silky quality covering the entire crystal gives rise to a greenish-yellow brilliance with a soft luster, and from certain angles, the strong fire characteristic of zircon flashes vividly.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAlthough there are minute inclusions, they are completely imperceptible to the naked eye, and the uniform silky texture enhances its beauty.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eFurthermore, growth lines overlap within the crystal, allowing for a captivating depth when viewed through a loupe.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGreen zircons that possess brightness, vibrancy, and a silky texture are rare and highly sought after in the market.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease enjoy the unique brilliance of this beautifully colored and crystallized piece, meticulously polished by GTJ, in your own hands.\u003c\/span\u003e\u003c\/p\u003e","brand":"GemTreeJapan","offers":[{"title":"Default Title","offer_id":49555796000961,"sku":null,"price":81000.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_6350_8fa3d35c-c665-4f8f-9b2f-950a0cdffacb.png?v=1758616073"},{"product_id":"green-zircon-4-385ct-madagascar","title":"Green Zircon 4.385ct \/ Madagascar","description":"\u003cp\u003eGreen Zircon 4.385ct\u003c\/p\u003e\n\u003cp\u003e7.13×13.29×5.96mm\u003c\/p\u003e\n\u003cp\u003eProduct of Madagascar\u003c\/p\u003e\n\u003cp\u003ePear shape\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003e\"Piachan\"\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \/ \"Tenchan\"\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003eCollaboration\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003eWith sorting (EGL simple identification report)\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003e¥297,000-\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA green zircon that evokes the depths of a dark forest, from which a vibrant flash of fresh greenery emerges.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eTo maximize this rare hue, the main cutter, Piachan, shaped the rough stone from its raw stage, and Tenchan, a polishing specialist, spent an entire day meticulously polishing it. This piece is a collaboration between the two.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAmong green zircons, which tend to have brownish or dull tones, this stone stands out for its clear and classic green.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eIn the long silhouette of the pear shape, the facets of the flower cut delicately scatter light, and a bright green sparkle blooms from within the deep green.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eInside, there are fingerprint-like inclusions, faint brown streaks, needle inclusions, and growth lines. These give the stone a sense of vitality and, together with its over 4ct volume, embody the energy of the earth.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eGreen zircons with beautiful cuts are extremely rare.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis stone, born despite the difficulty of polishing, bears the mark of the artisans' concentration and synergy.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease enjoy the true essence of green zircon, a proud offering from GemTreeJapan.\u003c\/span\u003e\u003c\/p\u003e","brand":"GemTreeJapan","offers":[{"title":"Default Title","offer_id":49575162970305,"sku":null,"price":297000.0,"currency_code":"JPY","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_7479_26f32d44-be53-460f-97c8-b15751c1b58c.png?v=1759567596"},{"product_id":"green-zircon-11-489ct-madagascar","title":"Green Zircon 11.489ct \/ Madagascar","description":"\u003cp\u003eGreen Zircon 11.489ct\u003c\/p\u003e\n\u003cp\u003e10.67×18.41×6.43mm\u003c\/p\u003e\n\u003cp\u003eMadagascar origin\u003c\/p\u003e\n\u003cp\u003eFancy shape\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s1\"\u003eCut by Pi-chan \/ Polished by Pu-chan\u003c\/span\u003e\u003cspan class=\"s2\"\u003e \u003c\/span\u003e\u003cspan class=\"s1\"\u003eWork\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e\u003cspan class=\"s2\"\u003eComes with a sorting report (EGL simple identification report)\u003cbr\u003e\u003cbr\u003e￥540,000-\u003c\/span\u003e\u003c\/p\u003e\n\u003cp class=\"p1\"\u003e \u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eA stunning green zircon from Madagascar, weighing over 11ct.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis unique stone, created under the direction of the GemTreeJapan founder, features an irregular tapered shape with rounded edges, balancing both form and light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eStarting with a large crystal that had a special shape in its rough state, it was transformed into its ideal form by the main cutter, Pi-chan, under the founder's direction.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eAfterward, Pu-chan, a polishing specialist, meticulously spent a full day on the finishing touches, precisely balancing each facet to ensure an uninterrupted flow of light.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhile many green zircons have brownish tones or dullness, this stone is truly a \"classic green.\"\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWithin its deep body color, a fresh green light shines through, and the high dispersion characteristic of zircon creates a vivid, colorful fire.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThe central step cut reflects light beautifully in straight lines, and the finely edged facets toward both ends add a delicate sparkle, creating a three-dimensional brilliance as if light flows into the center of the stone.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWhile there are white striations and fine inclusions visible internally, these are natural memories that add depth to the stone and do not detract from its beauty.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eWith a slightly reduced thickness, light leakage is minimized, and from certain angles, a deep brilliance returns from behind the steps.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003e\u003c\/span\u003e\u003cbr\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003eThis is a unique green zircon, directed by the founder of GemTreeJapan, which takes advantage of the unusual shape of the rough stone and elevates it into a creative cut.\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cspan\u003ePlease take your time to enjoy this large stone, which combines both substantial presence and transparency.\u003c\/span\u003e\u003c\/p\u003e","brand":"GemTreeJapan","offers":[{"title":"Default Title","offer_id":49575181615297,"sku":null,"price":540000.0,"currency_code":"JPY","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/files\/IMG_7455_0428cf9c-7eaa-4a66-b0ee-afe604621003.png?v=1759567912"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0533\/1120\/9665\/collections\/02F46BD9-791B-4A04-BF6C-79E04E012F35.jpg?v=1759123640","url":"https:\/\/irmo.jp\/en\/collections\/2025-9-23greenzircon.oembed","provider":"IRMO.JP","version":"1.0","type":"link"}