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demantoid

American  
[dih-man-toid] / dɪˈmæn tɔɪd /

noun

Mineralogy.
  1. a brilliant green variety of andradite garnet, used as a gem.


demantoid British  
/ dɪˈmæntɔɪd /

noun

  1. a bright green variety of andradite garnet

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Etymology

Origin of demantoid

1890–95; < German, equivalent to (obsolete) Demant diamond (< Middle High German diemant < Old French diamant ) + -oid -oid

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Two items from the Chelsea Antique Fair in London: left, an 1875 frog brooch, set with demantoid garnets and ruby eyes; right, a pickling jar, circa 1880.

From New York Times • Mar. 20, 2011

The luster, too, is diamond-like as the name "demantoid" signifies.

From A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public by Wade, Frank Bertram

As was explained under garnet, jewelers frequently use the term "olivine" to designate demantoid garnet.

From A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public by Wade, Frank Bertram

The hardness is only 6.5, or lower even than that of quartz—a character rather adverse to the use of demantoid as a gem.

From Encyclopaedia Britannica, 11th Edition, Volume 7, Slice 10 "David, St" to "Demidov" by Various

The green garnet that is called "olivine" in the trade also approaches diamond in luster, hence the name "demantoid," or diamond like, sometimes applied to it.

From A Text-Book of Precious Stones for Jewelers and the Gem-Loving Public by Wade, Frank Bertram