Top 10 Gemstone Special Effects Inherent In the MineralMetal_Treasure
The Top Ten
It's the ability of the stone to draw light apart into its constituent colors, similarly to the glass prism.
Gems that produce the "biggest fire": diamond, zircon, benitoite and sphalerite - Metal_Treasure
The ability to create a star effect - star sapphires and star rubies do it best. - Metal_Treasure
Opals do it all the time. They just play with light and you may think that there are objects inside the gem but there aren't actual objects. - Metal_Treasure
Alexandrite is known for that - it may look green in daylight and red under incandescent light. - Metal_Treasure
"Chatoyance" is French for cat's eye.
Chrysoberyl does it best, the variety known as Cat's Eye Chrysoberyl (in the image).
Chatoyancy is also found in Tiger's Eye. - Metal_Treasure
The ability to turn incoming light of ultraviolet color into light of a visible color. For example, Benitoite (a blue gem) fluoresces red under long-wave UV light. - Metal_Treasure
An effect also known as adularescence and milkiness - opal, moonstone, agate and milky quartz are the gems best known for this special effect. - Metal_Treasure
It's an impressive flash of blue and golden color as the stone is moved in the light.
This effect was named for Labradorite (in the picture) - Metal_Treasure
It's a rainbow effect best displayed by fire agate and some obsidian. - Metal_Treasure
It refers to inclusions that create internal sparkles, particularly in quartz (aventurine) - Metal_Treasure
It's the ability to exhibit different colors when observed at different angles (ex., Andalusite, Iolite) - Metal_Treasure
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3. Schiller (Play of Color)