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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. Alrosa - Wikipedia

    en.wikipedia.org/wiki/ALROSA

    Alrosa (Russian: АЛРОСА) is a Russian group of diamond mining companies that specialize in exploration, mining, manufacture, and sale of diamonds. The company leads the world in diamond mining by volume. [2] [3] Mining takes place in Western Yakutia, the Arkhangelsk region, and Africa. Alrosa is Russia's leading diamond mining and ...

  4. Engagement ring - Wikipedia

    en.wikipedia.org/wiki/Engagement_ring

    Rings with a larger diamond set in the middle and smaller diamonds on the side fit under this category. Three-stone diamond engagement rings, sometimes called trinity rings or trilogy rings, are rings with three matching diamonds set horizontally in a row with the bigger stone placed in the center. The three diamonds on the ring are typically ...

  5. Synthetic diamond - Wikipedia

    en.wikipedia.org/wiki/Synthetic_diamond

    Around 2016, the price of synthetic diamond gemstones (e.g., 1-carat stones) began dropping "precipitously", by roughly 30% in one year, becoming clearly lower than that of mined diamond gems. [120] As of 2017, synthetic diamonds sold as jewelry were typically selling for 15–20% less than natural equivalents; the relative price was expected ...

  6. Koh-i-Noor - Wikipedia

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

    The diamond is currently set in the Crown of Queen Elizabeth The Queen Mother. There are multiple conflicting legends on the origin of the diamond. [9] However, in the words of the colonial administrator Theo Metcalfe, there is "very meagre and imperfect" evidence of the early history of the Koh-i-Noor before the 1740s. [10]

  7. 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]

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