Glittering Stones » Semi Precious Stones » Turquoise

Semi Precious Stone Turquoise

Turquoise is a beautiful blue opaque semi-precious gemstone. The highest grades are "robin's egg blue," and the color of the blue sky. Inferior grades are greenish. Turquoise that fades in color is also inferior. Turquoise is a phosphate of aluminum with small quantities of copper and also iron. The gem is slightly harder than glass.

Ancient and yet always at the height of the current fashion: that is Turquoise for you. Its brilliant sky-blue belongs to the all-time favorite trend colour in the world of fashion and jewellery.

Historical Facts of Turquoise

Refractive index: 1.61 - 1.65

Chemical Composition: CuAl6(PO4)4(OH)8·4H2O

Crystal system: Triclinic

Mohs Scale hardness: 5 - 6

Luster: Waxy to subvitreous

Specific gravity: 2.6 - 2.9

Color: Blue, blue-green, green

Ocurrence: Afghanistan, Australia, India, northern Chile, Cornwall, Saxony, Silesia, Turkestan, Tibet

Gem Stone Turquoise Jewelry