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Turquoise is composed primarily of copper, aluminum and phosphorus, and can occur as a result of weathering and oxidation of minerals containing those elements in arid climates. For example, water can erode the copper from azurite and malachite, the aluminum from feldspar minerals and the phosphorus from apatite.
Bora Jewelry added the slightest gold-plating around this turquoise. The ring is oxidized sterling silver. Size 8.