Turquoise was mined by Egyptians as early as 6000 BC and is probably the most valuable, non-transparent mineral in the jewelry trade.

Turquoise is hydrated copper and aluminum phosphate that is widely used as a gemstone. Turquoise forms when water filters through rocks that contain copper, aluminum and other minerals. This forms a chemical reaction, which results in deposits of what we know as turquoise.

It appears blue to green, with waxy veins in aluminum-rich, volcanic or sedimentary rocks.

Turquoise is an opaque mineral which provides a beautiful contrast with precious metals and is the most valued color for gem purposes. Some collectors prefer turquoise that is delicately veined within a matrix of impurities of limonite or other substances.