Turquoise is an opaque copper-bearing basic aluminium phosphate. Since millennia, turquoise has been prized as a gemstone for its unique color, of which, was named after the gemstone and not the other way around. The brilliant sky-blue color of fine turquoise has never lost its fascination by gemstone and gemstone jewelry lovers, while rare green turquoise is popular among collectors and those seeking rare and exciting jewelry. It has easily become one of the most classic stones to be set with silver, along with lapis lazuli, its blue sister-stone. Turquoise is cut en cabochon and can be used for all kinds of jewelry, including rings, necklaces, brooches, bracelets and earrings. Turquoise is December's official birthstone and it is believed to promote good fortune, happiness and a longevity.