Gem Turquoise is actually very rare as about 5% of all Turquoise ever found was high grade or gem quality Turquoise. Gem Grade Turquoise is Turquoise that has matured to the hardness of a 5 on the Mohs scale of gemstone hardness. At this state of hardness the stone has become almost agatized and has become very stable and is easy to polish to a brilliant, glass like finish.
Durango Silver Company has written a very nice article on Gem Turquoise and invite you to visit the page.
We also have included a lot of photos of Gem Turquoise Jewelry for you to see what Gem Turquoise looks like in Southwestern Turquoise Jewelry.