- (of certain stones) having commercial value, but less than a precious stone
WordReference Random House Learner's Dictionary of American English © 2020
- Jewelryhaving commercial value as a gem but not precious:semiprecious minerals such as amethyst and garnet.
- Jewelry(of a stone) having commercial value as a gem but not classified as precious, as the amethyst or garnet.
- semi- + precious 1885–90