62 coaches online • Server time: 23:24
Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium.
It is rare and valuable in finer grades and has been prized as a gem and ornamental
stone for thousands of years owing to its unique hue.
In recent times turquoise, like most other opaque gems, has been devalued by the
introduction of treatments, imitations, and synthetics onto the market.
The substance has been known by many names, but the word turquoise was derived
around the 16th century from the French language turquie, for Central Asian
material which was early imported through Turkey.