Turquoise Sterling Silver PendantSky blue copper phosphate with five thousand years of wear behind it. Turquoise is copper aluminum phosphate, Mohs hardness 56, its distinctive color ranging from robins egg blue to teal as iron content increases. This oval cabochon is set in solid . 925 sterling silver. The stone has been traded and worn since at least 3000 BCEfound in Egyptian burial sites, Aztec ceremonial objects, and Persian royal collections. Major sources include Iran, the