The cat s eye or chatoyancy effect is most easily seen in strong light especially in sunlight.
Blue cat s eye tourmaline.
Compounded with elements such as aluminium iron magnesium sodium lithium or potassium.
Tourmaline is a crystalline boron silicate mineral.
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Likewise other gemstones families tourmaline also comes in a wide variety of colors.
About cat s eye tourmaline.
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The optical phenomenon is exceptionally rare and occurs in only a handful of gems.
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Cat s eye tourmaline stones are usually found in pink and green.
It is a semi precious stone.
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They are not uncommon but can be difficult to find.
The technical term used by gemologists to refer to a cat s eye effect is chatoyancy a term derived from the french phrase oeil de chat which means eye of the cat.