Alphabetical List of Precious and Semiprecious Gemstones
https://www.thoughtco.com/alphabetical-list-of-precious-and-semiprecious-gemstones-4134639
WebNov 26, 2019 · The only "precious" gemstones are diamond, ruby, sapphire, and emerald. All other quality stones are called "semiprecious," even though they may not be any less valuable or beautiful. Today, mineralogists and gemologists describe stones in technical terms, including their chemical composition, Mohs hardness , and crystal structure.
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