Turquoise is a natural, light blue to deep bluish-green colored, semi-precious gemstone variety of the Phosphate mineral family. Turquoise gemstone is worn as the December month birthstone. Turquoise mines are present in Iran (Persia), Tibet, Mexico, Arizona, Egypt, Turkey and America etc. In the gemstone market, Persian Turquoise stone is regarded as a highly sought-after origin variety due to its brilliant blue hue, high clarity and waxy to matt luster.In terms of quality, color saturation and tone are the critical factors of Turquoise. Firoza colour generally ranges from light sky blue to deep blue and bluish green etc. According to the traders, the vivid blue (generally found in Sleeping beauty mine, Arizona) or the evenly saturated medium blue turquoise (traded as Persian blue) are considered most desirable shades. Most of the natural Turquoise stones are nearly opaque with little or significantly visible matrix and spots. Clean, spotless Turquoise is rare to find and quite valuable. Turquoise is considerably durable gemstone (Turquoise hardness – 5 to 6 on the Mohs scale) and is therefore found numerous shapes.