Kevas were commonly traded goods among merchants during the 23rd and 24th centuries.

Spock posed as a trader of kevas and trillium while on Organia. Arne Darvin did the same while aboard the USS Defiant. (TOS: "Errand of Mercy"; DS9: "Trials and Tribble-ations")

In the first draft script of TOS: "The City on the Edge of Forever", keva was established as a kind of Vulcan food which contained purple juice.
The Star Trek Encyclopedia (4th ed., vol. 1, p. 414) described them as gemstones.

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