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Vitreous is defined as a glass-like luster. Gems with a R.I from 1.3 - 1.8. Example: Moonstone can exhibit a Vitreous luster. Subvitrious luster is somewhat less glass-like.

This Art Deco moonstone ring is an excellent example of a stone with vitreous luster. Photo courtesy of Lang Antiques.
Lang Antiques
Lang Antiques