Pearl
Darlene wearing pearl jewelry
A pearl was type of valuable gemstone produced by certain mollusks, particularly oysters. They could be used to make jewelry.
A wise saying was sometimes known as a "pearl of wisdom". (VOY: "Fair Haven")
In 1953, Darlene Kursky wore a pearl necklace and earrings. (DS9: "Far Beyond the Stars")
Veltan sex idols were often adorned with pearls. When Kivas Fajo informed Palor Toff that he had four of these artifacts in 2366, Toff asked if they had their pearls intact. Fajo dismissed his question, explaining that Ferengi agents added pearls after the fact to increase the object's value. (TNG: "The Most Toys")
Pearls were among the wealth slated for disposal by the Targalans after they transitioned to a post-scarcity society in 2382. (LD: "Shades of Green")