Very old Turquoise
For a lot of Americans, turquoise seems a particularly American gem -- extracted in Arizona, New Mexico, Colorado and Nevada, and with a protracted record in native American jewelry.
But turquoise has been an worthy gem in lots of eastern cultures for 1000's of years. This is reflected in the English name for the precious stone, since it was initially brought to Europe by traders from Asia Minor. Although possibly the turquoise came from infamous turquoise mines in Iran or Egypt, not Turkey.
Turquoise, along with lapis lazuli, is one of the oldest gemstone materials known to man. The color of turquoise is so exclusive that this has developed into the customary declaration we utilize to illustrate the vaguely greenish shade of cyan and analogous colors.
The legendary address of the world's best turquoise is the mines at Nishapur in Iran. Turquoise became a chief trade and barter article for the early Persians. Persian turquoise was discovered in ancient graves in Turkistan and, in the first to 3rd century A.D., in graves all the way through the Caucasus.
For centuries, the most precious turquoise arrived from Iran but nowadays deposits are additionally discovered in Afghanistan, Argentina, Australia, Brazil, China, Israel, Egypt, Mexico and Tanzania. The label "Persian Turquoise" is at the present normally used to refer to any turquoise precious stone that does not have the black or brown veining usually found in turquoise mined in the Us of a and used in a sort of adornments created by the American Indians.
From the gemological perspective, turquoise is a hydrous phosphate of copper. It is fairly spongy, with the hardest specimens reaching just 6 on the Mohs range. Despite its softness, turquoise takes a exceptionally first-class polish. Turquoise is all the time opaque and the color varies from blue to green, now and then with flecks of pyrite or interspersed with dark, spidery limonite veining.
Resembling many gemstones, the demand for high quality turquoise exceeds the source. This has led to the growth of treatment methods to upgrade the hue and durability of poorer cost matter. Softer and extra absorbent turquoise can be enhanced by impregnating the gemstone under pressure by means of hot acrylic resins. The resins improve the color, rigidity, and resilience of the material. As long as the materials are represented as treated, this is regarded as an usual practice in the gem industry.
Color preferences for turquoise fluctuate by locality. It has long been considered that a more powerful blue with less green is more advantageous, still in Tibet a greener blue is chosen. Turquoise displaying a spiderweb pattern, from the matrix or mother stone from which the turquoise came, is valued in the USA; but in the near East clear vein-free material is favored.
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