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Two-Tone Copper Purple Turquoise Arizona Multi Band Ring Size 9.5 925 Stamped Solid Sterling Silver 925 Parts Per 1000 Genuine Cooper Turquoise Composite Stone Brass/copper and silver colored Turquoise is an opaque, blue-to-green mineral that is a hydrated phosphate of copper and aluminium, with the chemical formula CuAl₆(PO₄)₄(OH)₈·4H₂O. It is rare and valuable in finer grades and has been prized as a gemstone and ornamental stone for thousands of years owing to its unique hue.