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water sapphire

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noun
  1. a transparent variety of cordierite, found in Sri Lanka, Madagascar, and elsewhere, sometimes used as a gem.
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Origin of water sapphire

First recorded in 1690–1700
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for water sapphire

water sapphire

noun
  1. a deep blue variety of the mineral cordierite that occurs in Sri Lanka: used as a gemstone
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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