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  2. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    These green tanzanite have some meaningful value in the collector market, but are seldom of interest to commercial buyers. [ 31 ] Heat-treating in a furnace is usually carried out at between 370 and 390 °C (698 and 734 °F) for 30 minutes.

  3. Prices of chemical elements - Wikipedia

    en.wikipedia.org/wiki/Prices_of_chemical_elements

    This is a list of prices of chemical elements. Listed here are mainly average market prices for bulk trade of commodities. Data on elements' abundance in Earth's crust is added for comparison. As of 2020, the most expensive non-synthetic element by both mass and volume is rhodium.

  4. Carat (mass) - Wikipedia

    en.wikipedia.org/wiki/Carat_(mass)

    The carat (ct) is a unit of mass equal to 200 mg (0.00705 oz; 0.00643 ozt), which is used for measuring gemstones and pearls. The current definition, sometimes known as the metric carat , was adopted in 1907 at the Fourth General Conference on Weights and Measures , [ 1 ] [ 2 ] and soon afterwards in many countries around the world.

  5. TanzaniteOne - Wikipedia

    en.wikipedia.org/wiki/TanzaniteOne

    They have the ability to purchase large amounts of rough and have wholesale and retail distribution networks in place to facilitate the sale of loose tanzanite and finished jewellery. In August 2013 TanzaniteOne [4] announced they had opened an online boutique, www.tananiteoneonline, which sold tanzanite gemstones and tanzanite set gold ...

  6. Richland Resources - Wikipedia

    en.wikipedia.org/wiki/Richland_Resources

    Richland Resources Ltd is a gemstone mining, development and exploration company who are listed on the London Stock Exchanges AIM market. [1] (AIM:RLD) Richlands developed and operated TanzaniteOne Mining Ltd – the world's largest tanzanite gemstone mining company, based in Merelani, Tanzania from August 2004 until March 2015. The Company ...

  7. Market value - Wikipedia

    en.wikipedia.org/wiki/Market_value

    Market value or OMV (Open Market Valuation) is the price at which an asset would trade in a competitive auction setting. Market value is often used interchangeably with open market value , fair value or fair market value , although these terms have distinct definitions in different standards, and differ in some circumstances.

  8. Sapphire - Wikipedia

    en.wikipedia.org/wiki/Sapphire

    In October 2014, Sotheby's Hong Kong achieved consecutive per-carat price records for Kashmir sapphires – first with the 12.00 carat Cartier sapphire ring at US$193,975 per carat, then with a 17.16 carat sapphire at US$236,404, and again in June 2015 when the per-carat auction record was set at US$240,205. [39]

  9. Gemstone - Wikipedia

    en.wikipedia.org/wiki/Gemstone

    The socio-economic dynamics of the gemstone industry are shaped by market forces and consumer preferences and typically go undiscussed. Changes in demand and prices can significantly affect the livelihoods of those involved in gemstone mining and trade, particularly in developing countries where the industry serves as a crucial source of income ...

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