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$475.00 USD
価格
771
3

421 CTS TURQUOISE ROUGH PARCEL-BLUE DIAMOND MINE

SKU
F9363
寸法(mm)
36.000 x 21.000 x 10.000mm
重さ (CT)
421.000
Treatment
No Treatment
タイプ
Rough

''BLUE DIAMOND MINE ''TURQUOISE ROUGH

This is a natural untreated rough piece ready for cutting. You have the option to treat it or leave it natural. Mined at the Blue Diamond Mine in the USA.

We have taken the photo with the stone wet.

Weight & Size app



Turquoise is an opaque, blue-to-green mineral that is a hydrous phosphate of copper and aluminium. 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. In recent times turquoise, like most other opaque gems, has been devalued by the introduction of treatments, imitations, and synthetics onto the market.

USA TURQUOISE

 

 

 

The Southwest United States is a significant source of turquoise; Arizona, California (San Bernardino, Imperial, and Inyo counties), Colorado (Conejos, El Paso, Lake, and Saguache counties), New Mexico (Eddy, Grant, Otero, and Santa Fe counties) and Nevada (Clark, Elko, Esmerelda County, Eureka, Lander, Mineral County and Nye counties) are (or were) especially rich. The deposits of California and New Mexico were mined by pre-Columbian Native Americans using stone tools, some local and some from as far away as central Mexico. Cerrillos, New Mexico is thought to be the location of the oldest mines; prior to the 1920s, the state was the country's largest producer; it is more or less exhausted today. Only one mine in California, located at Apache Canyon, operates at a commercial capacity today.

The turquoise occurs as vein or seam fillings, and as compact nuggets; these are mostly small in size. While quite fine material—rivalling Iranian material in both colour and durability—is sometimes found, most American turquoise is of a low grade (called "chalk turquoise"); high iron levels mean greens and yellows predominate, and a typically friable consistency precludes use in jewellery in the turquoise's untreated state. Arizona is currently the most important producer of turquoise by value. Two mines exist in the state, one is the Sleeping Beauty Mine in Globe, the other is the Kingman Mine that operates alongside a copper mine outside of the city.

Nevada is the country's other major producer, with more than 120 mines which have yielded significant quantities of turquoise. Unlike elsewhere in the US, most Nevada mines have been worked primarily for their gem turquoise and very little has been recovered as a byproduct of other mining operations. Nevada turquoise is found as nuggets, fracture fillings and in breccias as the cement filling interstices between fragments. Because of the geology of the Nevada deposits, a majority of the material produced is hard and dense, being of sufficient quality that no treatment or enhancement is required. While nearly every county in the state has yielded some turquoise, the chief producers are in Lander and Esmerelda Counties. Most of the turquoise deposits in Nevada occur along a wide belt of tectonic activity that coincides with the state's zone of thrust faulting.

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sedagems
sedagems
Hi Welcome to the Sedagems store, Run by Paul Sedawie and specializing in Australian sapphires and gems stones he has collected on his many buying trips world wide. All stock has a money back guarantee as your continued business is our business.
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  • gemarab
    gemarab
    ポジティブ

    Great and clear sapphire, beautiful cut ! Great packaging

  • js20031
    js20031
    ポジティブ

    AAAA+++ Very Happy! Just like the pic.

  • js20031
    js20031
    ポジティブ

    AAAA+++ Very Happy! Just like the pic.

監査

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発送詳細

配送:
$16.00 Registered Shipping 経由の日数をカウント
発送元:
Australia

支払いオプション

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この出品者は、Australia での取引に 10.00% 税金を追加します。

概要

リストタイプ : Standard
製品番号 : 2201041
始まります : 31st October 2024 10:12 pm PDT
* すべての価格は:通貨で表示されます