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2. 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.

3. Wittelsbach-Graff Diamond - Wikipedia

   en.wikipedia.org/wiki/Wittelsbach-Graff_Diamond

   The Wittelsbach diamond, before being recut by Graff. The original Wittelsbach Diamond, also known as Der Blaue Wittelsbacher, [3] was a 35.56-carat (7.112 g) fancy, deep, greyish-blue diamond with VS2 clarity that had been part of both the Austrian and the Bavarian Crown jewels. [4] Its colour and clarity had been compared to the Hope Diamond ...

4. Elizabeth Taylor Diamond - Wikipedia

   en.wikipedia.org/wiki/Elizabeth_Taylor_Diamond

   The Elizabeth Taylor Diamond, formerly known as the Krupp Diamond, is a 33.19-carat (6.638 g) diamond that was bought by Richard Burton for his wife, Elizabeth Taylor in 1968. The diamond was one of a number of significant pieces of jewellery owned by Taylor, her collection also included the 68 carat Taylor–Burton Diamond , which was bought ...

5. Carat (mass) - Wikipedia

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

   In the United Kingdom the original Board of Trade carat was exactly 3 + 1647 ⁄ 9691 grains (~3.170 grains = ~205 mg); [ii] in 1888, the Board of Trade carat was changed to exactly 3 + 17 ⁄ 101 grains (~3.168 grains = ~205 mg). [iii] Despite it being a non-metric unit, a number of metric countries have used this unit for its limited range of ...

6. 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 ...

7. Diamond color - Wikipedia

   en.wikipedia.org/wiki/Diamond_color

   Fancy-colored diamonds such as the deep-blue Hope Diamond are among the most valuable and sought-after diamonds in the world. 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 ...