UK:*UK and possibly other pronunciationsUK and possibly other pronunciations/ˌsɛmiˈprɛʃəs/

US:USA pronuncation: IPAUSA pronuncation: IPA/ˌsɛmiˈprɛʃəs, ˌsɛmaɪ-/

US:USA pronunciation: respellingUSA pronunciation: respelling(sem′ē preshəs, sem′ī-)

WordReference Random House Learner's Dictionary of American English © 2020
sem•i•pre•cious /ˌsɛmiˈprɛʃəs, ˌsɛmaɪ-/USA pronunciation   adj. 
  1. Jewelryhaving commercial value as a gem but not precious:semiprecious minerals such as amethyst and garnet.
See -preci-.
WordReference Random House Unabridged Dictionary of American English © 2020
sem•i•pre•cious  (sem′ē preshəs, sem′ī-),USA pronunciation adj. 
  1. Jewelry(of a stone) having commercial value as a gem but not classified as precious, as the amethyst or garnet.
  • semi- + precious 1885–90

Collins Concise English Dictionary © HarperCollins Publishers::
semiprecious /ˌsɛmɪˈprɛʃəs/ adj
  1. (of certain stones) having commercial value, but less than a precious stone
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