semi·pre·cious /-ˈprɛʃəs/
 (a.)半珍貴的,准寶石的


 Sem·i·pre·cious a. Somewhat precious; as, semiprecious stones or metals.  Used mostly of gemstones used in jewelry, such as amethyst, garnet, or iolite, which are sufficiently rare to have commercial value, but are not considered as precious, as are the diamond, emerald, and ruby.

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 semiprecious
      adj : used of gemstones having less commercial value than precious
            stones; "such semiprecious stones as amethyst, garnet,
            jade, and tourmaline"