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https://www.consumer.ftc.gov/articles/gemstones-diamonds-and-pearls
You can measure a gemstone by weight, size, or both. The basic unit for weighing a gemstone is the carat — which is different from the “karat” used for gold. A carat is equal to one-fifth of a gram and is divided into 100 units, called points. For example, a half-carat gemstone weighs 50 points.
https://www.gemsociety.org/article/a-consumers-guide-to-gem-grading/
For example, a quarter-carat topaz may cost $60 per carat, or $15 total. A half-carat topaz, with the same color, clarity, and cutting grades, might cost $100 per carat, or $50 total. For a topaz one-carat and over in size, the price could reach $200 per carat. So, a one-carat stone will cost $200 total, not $60 or $100.
https://www.gemsociety.org/gemstone-encyclopedia/
Gemstone Encyclopedia. Our Gemstone Encyclopedia has information on over 300 gemstones, from traditional and popular jewelry standards to collector’s stones that rarely appear for sale. Each entry has photos and detailed information about the gem’s properties. Entries for jewelry stones also have price guidelines and discussions of their most important value factors.
https://agta.org/wp-content/uploads/2018/05/15thEditionGemstoneInformationManual.pdf
May 15, 2018 · for sale or sells a gemstone or jewelry product containing gemstones to a buyer within the trade. Use of the disclosure codes provided herein gives the gem and jewelry industry a convenient means of complying with disclosure of gemstone treatment within the trade as required by the Federal Trade Commission Guides.
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