2025.5.16 What is hyalite?

Good morning, this is Nori-chan.
Today's blog is "GemTreeJapan Blog, which you can read in just a few minutes without getting tired and is fun!"

~ Introduction ~

Fluorescence is great.
It doesn't change color under UV rays...it actually glows.

But I need to convey it correctly, right? So I looked it up on Wikipedia, and found this:
My brain rejected it, so I settled for "Fluorescence is cool!"

Ruby (pink sapphire) and alexandrite fluoresce red due to chromium.
Some spinels (transparent or gray) can fluoresce yellow, red, or green.
Isn't that interesting?


The fluorescence of ruby, alexandrite, and pink spinel is due to the elements that make them up, so it's only natural, so be careful not to buy them based solely on sales pitches like, "They fluoresce, right? Isn't that amazing?"

On the other hand, it's unusual for something that doesn't normally fluoresce to fluoresce, so I want one myself.


~Main topic~

The fluorescent stone (1.210ct) is my favorite. The swirl is amazing.
I think you can see it with your naked eye due to its size.

Hyalite is a type of common opal (※) that is basically colorless and transparent, and its Japanese name is gyokudetsuseki .

Opal is also called opal, but this opal has a different Japanese name, perhaps due to the process by which it is created.
*Common opal = no play of color

Hyalite is particularly easy to understand, and if you look at the internal structure you can see a structure that looks like water flowing.

Opal is not formed by atoms being arranged in a regular pattern, so it is not called a crystal, but is classified as amorphous (*).

The way they are attached to the bedrock in a grape-like shape makes them look like crystallized water.

*Opal is amorphous silicon dioxide, and other materials include amber (organic matter) and tektite (glass).

This fluorescence is caused by uranium ( U ). The amount of uranium determines the intensity of this fluorescence.

The more there is, the stronger the fluorescence.

Also, due to their structure (growth), very few of them fluoresce uniformly, and they exhibit beautiful, fluctuating fluorescence.

The photo above shows hyalite from Mexico, which turns a vibrant fluorescent green in strong sunlight.

These are merely trace radioactive elements mixed in. It works on the same principle as uranium glass.

GemTreeJapan used to deal with gemstones from Mexico, but now it mainly deals with gemstones from Hungary.

The hyalite we currently handle has had its origin identified by the Japan-German Gemological Institute , and is therefore highly reliable.

Unlike some sapphires and demantoid garnets, the average person cannot tell the difference between Mexican and Hungarian garnets, so this certificate of origin is very significant .

The current sale items come with the report above, so we hope you will pick one up.

This may sound a bit vulgar, but even for Nori-chan, who is a member, the cost of identifying the origin, including appraisal, is just under 10,000 yen.

Among the items for sale, 40% of the sales price will go towards the appraisal certificate, a desperate sale that could see the item sell off in a big way.

※Old stock release sale🤣

If you want to get it...now is the time!