The Collaborative International Dictionary
Water sapphire
Water sapphire \Wa"ter sap"phire\ [Equiv. to F. saphir d'eau.] (Min.) A deep blue variety of iolite, sometimes used as a gem; -- called also saphir d'eau.
Wiktionary
water sapphire
n. (context mineralogy English) A deep blue variety of iolite, sometimes used as a gem.
WordNet
water sapphire
n. a deep blue cordierite often used as a gemstone
Usage examples of "water sapphire".
The dry haze of autumn was three or four weeks in the future, and the air was crystalline, showing the icy water sapphire-blue to the horizon.