se·mi pre·cious gem·stone | ˈse-mē-pre-shəs jem-ˌstōn
noun
A stone that is less rare and less expensive than precious stones, but is still valued for its beauty
Modern semi-precious gemstones include beryl, chalcedony, agates, onyx, tourmaline, spinel, topaz, turquoise, zircon, amethyst, Alexandrite, cat's eyes, bloodstones, moonstones, and sunstones