Here you will find links to all sort of curiosities about Gemstones ranging from Carbon (the material in Diamonds) to definitions of the terms Carat vs. Karat, Dendrites vs. Dendritics. Links to other scales for gems can be found here under Other Gem Sites.
I also should direct you to our very popular Automatic Calculations, our 10 Minutes of Fame and the ephemeral White Rabbit Theory.
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