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2. Diamond (gemstone) - Wikipedia

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

   The value of a diamond gemstone depends upon colour and quality, as well as weight. As of April 2024 the average price per carat of diamonds of between 1.00 and 1.49 carats was US$4,448. [49] The price of diamonds dropped significantly from a peak in 2022; prices of natural gems in shops dropped by 26% by the beginning of 2025.

3. 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.

4. Diamond color - Wikipedia

   en.wikipedia.org/wiki/Diamond_color

   In 2009, a 7-carat (1.4 g) blue diamond fetched the then highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (US$9.5 million at the time) which is in excess of US$1.3 million per carat. [17]

5. Cullinan Diamond - Wikipedia

   en.wikipedia.org/wiki/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 interest, it was still ...

6. Koh-i-Noor - Wikipedia

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

   The Koh-i-Noor (Persian for 'Mountain of Light'; / ˌ k oʊ ɪ ˈ n ʊər / KOH-in-OOR), [b] [4] [5] also spelled 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 ...

7. Synthetic diamond - Wikipedia

   en.wikipedia.org/wiki/Synthetic_diamond

   As of 2023 the heaviest synthetic diamond ever made weighs 30.18 ct (6.0 g); [2] the heaviest natural diamond ever found weighs 3167 ct (633.4 g). Numerous claims of diamond synthesis were reported between 1879 and 1928 after English chemist Smithson Tennant demonstrated that diamonds are a form of carbon in 1797; [3] most of these attempts ...