Why have 1 when you can have 3?

Luckly for the love of gemstones

 Geminis and Cancer have 3 birthstones

Pearls , Moonstone and the  famously rare, colour - changing 

Alexandrite 

A gemstone  belonging to the chrysoberyl family

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Famously known for appearing emerald-green in daylight 

and shifting to raspberry-red or purplish-red under incandescent light.

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Represents balance, adaptability, and good fortune

 most famous origins of Alexandrite are in Russia

Other notable sources Brazil  Zimbabwe, Tanzania, and Sri Lanka. 

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used in 55th Wedding Anniversary