Turquoise

Turquoise was an opaque blue to greenish-blue gemstone, usually with blotches of darker hues.

Description
In the Realms this ornamental stone was found in the more arid locations and tumbled smooth or cut cabochon. Elves valued the pure color stones for casting sky-related magic and mages used turquoise in the creation of items related to flight. It was also used as a good luck charm by horsemen who would put a small shard in their horse's harness. A typical stone had a base value of 10 gp.