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  2. Diamond (gemstone) - Wikipedia

    en.wikipedia.org/wiki/Diamond_(gemstone)

    Since the per carat price of diamond shifts around key milestones (such as 1.00 carat (200 mg)), many one-carat diamonds are the result of compromising cut for carat. Some jewelry experts advise consumers to buy a 0.99-carat (198 mg) diamond for its better price or buy a 1.10-carat (220 mg) diamond for its better cut, avoiding a 1.00-carat (200 ...

  3. Cullinan Diamond - Wikipedia

    en.wikipedia.org/wiki/Cullinan_Diamond

    Cullinan Diamond. The Cullinan Diamond is the largest gem-quality rough diamond ever found, [2] weighing 3,106 carats (621.20 g), discovered at the Premier No.2 mine in Cullinan, South Africa, on 26 January 1905. It was named after Thomas Cullinan, the owner of the mine. In April 1905, it was put on sale in London, but despite considerable ...

  4. Koh-i-Noor - Wikipedia

    en.wikipedia.org/wiki/Koh-i-Noor

    The Koh-i-Noor (Persian for 'Mountain of Light'; / ˌkoʊɪˈnʊər / KOH-in-OOR), [ b ][ 4 ][ 5 ] also spelt Koh-e-Noor, Kohinoor and Koh-i-Nur, is one of the largest cut diamonds in the world, weighing 105.6 carats (21.12 g). [ a ] It is part of the Crown Jewels of the United Kingdom. The diamond is currently set in the Crown of Queen ...

  5. Gemological Institute of America - Wikipedia

    en.wikipedia.org/wiki/Gemological_Institute_of...

    Diamond reports from GIA (as well as other, for-profit sources) are now demanded by most consumers purchasing diamonds over a certain size, typically for over 0.5 carat (100 mg), and almost always for over 1.0 carat (200 mg), and are considered an important tool in guaranteeing that a diamond is accurately represented to a potential buyer.

  6. Kelsey Lake Diamond Mine - Wikipedia

    en.wikipedia.org/wiki/Kelsey_Lake_Diamond_Mine

    In 1996 the largest diamond found at the mine was discovered. Named the "Colorado Diamond," it was a 28.3-carat (5.66 g) yellow stone and the fifth-largest diamond found in North America. The gem was cut and polished by legendary New York diamond cutter Bill Goldberg which yielded a 5.39-carat (1.078 g) faceted stone that sold for $87,500. [5] [16]

  7. Mohs scale - Wikipedia

    en.wikipedia.org/wiki/Mohs_scale

    Diamond (Mohs 10) is 1500 (off scale). Diamond was the hardest known naturally occurring mineral when the scale was designed, and defines the top of the scale, arbitrarily set at 10. The hardness of a material is measured against the scale by finding the hardest material that the given material can scratch, or the softest material that can ...

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