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citrine

A Guide to Gem Classification

Little is simple and straightforward in gemology. Every established principle has an exception. This applies to gem classification as well.…

Gemstone Toxicity Table

Gem faceters and jewelry enthusiasts alike should learn about gemstone toxicity. This table has toxicity ratings for 280+ gems, based on their…

A Guide to Gem Cutting Styles

Gem cutting styles refer to the shape and arrangement of facets. The three most basic styles are brilliant, step, and mixed. Learn what characterizes…