[sem-ee-presh-uhs, sem-ahy-]
(of a stone) having commercial value as a gem but not classified as precious, as the amethyst or garnet.

1885–90; semi- + precious Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
semiprecious (ˌsɛmɪˈprɛʃəs)
(of certain stones) having commercial value, but less than a precious stone

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Example sentences
Semiprecious gemstones, tourmalines belong to a family of borosilicate minerals.
Precious and semiprecious stone deposits are numerous.
Tourmaline is used as a semiprecious gemstone when found in transparent crystals of red, pink, green or blue color.
Many semiprecious gemstones are in fact forms of chalcedony.
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