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Turquoise mat, colour green and shape rondell

Quick overview:

Turquoise mat, colour green and shape rondell. Turquoise belongs to the phosphates group, some gems are very porous, so it may be impregnated with wax, or resin to maintain its appearance, or enhance its colour. Iran is one of the oldest sources for Tyrquoise and still is, while it can be found also in Tibet, Africa, Australia, Ethiopia, Mexico, Chile, China and often in Europe.
Info: Turquoise was one of the first gemstones to be mined, Turquoise beads dating from about 5000BC have been found in Messopotamia. Egypt is another source of Turquoise back in the 4th century BC.