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Turquoise & Coral Directory  from A1 Jewelry Making Supplies

Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and
aluminum.
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.

Synthetics Turquoise has come onto the market. Some synthetics Turquoise that are difficult to detect even by experts.