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2. Material properties of diamond - Wikipedia

   en.wikipedia.org/wiki/Material_properties_of_diamond

   Theoretically, pure diamonds would be transparent and colorless. Diamonds are scientifically classed into two main types and several subtypes, according to the nature of defects present and how they affect light absorption: [8] Type I diamond has nitrogen (N) atoms as the main impurity, at a concentration of up to 1%. If the N atoms are in ...

3. Diamond color - Wikipedia

   en.wikipedia.org/wiki/Diamond_color

   Color grading of diamonds was performed as a step of sorting rough diamonds for sale by the London Diamond Syndicate. As the diamond trade developed, early diamond grades were introduced. Without any co-operative development, these early grading systems lacked standard nomenclature and consistency. Some early grading scales were; I, II, III; A, AA, AAA; A, B, C. Numerous terms

4. Millennium Star - Wikipedia

   en.wikipedia.org/wiki/Millennium_Star

   The Millennium Star is a diamond owned by De Beers. At 203.04 carats (40.608 g), it is the world's second-largest known top-color (grade D, i.e., colorless), internally and externally flawless, pear-shaped diamond. The diamond was discovered in the Mbuji-Mayi district of Zaire in 1990 in alluvial deposits; uncut, it was 777 carats (155.4 g). De ...

5. Archduke Joseph (diamond) - Wikipedia

   en.wikipedia.org/wiki/Archduke_Joseph_(diamond)

   The price was $6m above the $15m pre-sale estimate and more than three times the price of $6.5m it reached when it was last sold in 1993. The price fetched was a world record for a Golconda diamond and a world record price per carat for a colorless diamond. [1] [2] [3] [4]

6. Diamond (gemstone) - Wikipedia

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

   A diamond can be found in any color in addition to colorless. Some of the colored diamonds, such as pink, are very rare. A chemically pure and structurally perfect diamond is perfectly transparent with no hue, or color. However, in reality most gem-sized natural diamonds are imperfect. The color of a diamond may be affected by chemical ...

7. The Rock (diamond) - Wikipedia

   en.wikipedia.org/wiki/The_Rock_(diamond)

   The Rock is G-color, which is the fourth whitest level of white diamonds. [2] It is the highest grade in the near-colorless color range and only professionals can see a slight tint of color in a G-colored diamond. [3] The diamond is 61.3 grams (2.2 oz) and it has dimensions of 5.4 centimetres (2.1 in) by 3.1 centimetres (1.2 in). [2]