• WordNet 3.6
    • adj semiprecious used of gemstones having less commercial value than precious stones "such semiprecious stones as amethyst, garnet, jade, and tourmaline"
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Webster's Revised Unabridged Dictionary
    • a Semiprecious sĕm`ĭ*prĕsh"ŭs 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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Century Dictionary and Cyclopedia
    • semiprecious Valuable, but less so than the most highly prized objects of similar nature.
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In literature:

The bulk of this semiprecious metal goes to Navarro & Platt.
"The Trimmed Lamp" by O. Henry
They're beautiful, as you see, but they're not particularly valuable; only semiprecious.
"Average Jones" by Samuel Hopkins Adams
The interior is exquisite with lacelike carvings inlaid with semiprecious stones.
"Autobiography of a YOGI" by Paramhansa Yogananda

In news:

Scattering the dust of a common, semiprecious metal across equatorial soils may sponge carbon dioxide from the atmosphere and slow the pace of climate change.
Predator Turbo is the original, one-piece, metal-cutting carbide, ideal for rapid reduction of all dental materials, including amalgam, semiprecious and nonprecious metals, and tooth structure.