Semiprecious stones are stones such as turquoises and amethysts that are used in jewelry but areless valuable than precious stones such as diamonds and rubies.
semiprecious in British English
(ˌsɛmɪˈprɛʃəs)
adjective
(of certain stones) having commercial value, but less than a precious stone
semiprecious in American English
(ˌsɛmɪˈprɛʃəs)
adjective
designating gems of lower value than those classified as precious