Found only in a few places on earth, turquoise is the second of December’s two official birthstones. Sought after for its robin’s egg blue and unique spiderweb-like patterns, it’s a perfect gem for unusual jewelry designs.

GIA’s Turquoise Buying Guide tells you what to look for when it comes to color, texture, cut, and carat weight, to ensure that your turquoise has a long-lasting beauty all its own.

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