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A gemstone (or jewel) was any of a number of mineral forms, typically crystalline, some of which were greatly valued as precious stones in many cultures. These gemstones included diamonds, emeralds, rubies, sapphires, topaz, Rigelian flame gems, and tourmalines.
By the 23rd century, it was possible to synthesize most of these in any quantity required, rendering them essentially valueless, though many were still traded for low-end commercial use such as Spican flame gems. In 2267, Korob attempted to bribe members of the USS Enterprise crew with such stones; his flawed research led him to believe that they would be swayed by such a fortune. (TOS: "Catspaw")