Turquoise was designated the official gemstone of Arizona in 1974. Probably one of the oldest gemstones known, turquoise is an opaque, blue-to-green mineral. Only the prized robin's egg blue color is used to make gemstones. The majority of the world's finest-quality turquoise comes from western and southwestern United States, the largest producer of turquoise in the world.
 
Turquoise gemstones - photo © International Colored
Gemstone Association (ICA): Turquoise (used by permission)
Turquoise has been used extensively by both southwestern U.S. Native Americans and by many of the Indian tribes in Mexico since about 200 B.C. to make solid turquoise beads, carvings, and inlaid mosaics. Nearly all important deposits of turquoise are located near copper deposits in arid desert regions of the world. The quality of Arizona turquoise is world-famous.
Turqoise pebble (greenish and therefore considered low grade) - public domain photo by Adrian Pingstone / The Best Links.com
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