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  2. Wittelsbach-Graff Diamond - Wikipedia

    en.wikipedia.org/wiki/Wittelsbach-Graff_Diamond

    The Wittelsbach-Graff Diamond is a 31.06-carat (6.212 g) deep-blue diamond with internally flawless clarity, originating in the Kollur Mine, India. Laurence Graff purchased the Wittelsbach Diamond in 2008 for £16.4 million. In 2010, Graff revealed he had had the diamond cut by three diamond cutters to remove flaws.

  3. Diamond (gemstone) - Wikipedia

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

    While even a pale pink or blue hue may increase the value of a diamond, more intense coloration is usually considered more desirable and commands the highest prices. A variety of impurities and structural imperfections cause different colors in diamonds, including yellow, pink, blue, red, green, brown, and other hues.

  4. Diamond cut - Wikipedia

    en.wikipedia.org/wiki/Diamond_cut

    A diamond cut is a style or design guide used when shaping a diamond for polishing such as the brilliant cut.Cut refers to shape (pear, oval), and also the symmetry, proportioning and polish of a diamond.

  5. Rosy Blue - Wikipedia

    en.wikipedia.org/wiki/Rosy_Blue

    In 2005 Rosy Blue became a founding and certified member of the Responsible Jewellery Council. [14] [15] In 2008 Rosy Blue became a signatory to the United Nations Global Compact. [16] In 2017, Rosy Blue was named in both Panama Papers and Paradise Papers as an entity which transferred money to safe havens to avoid taxes in the country. [17]

  6. Graff (jewellers) - Wikipedia

    en.wikipedia.org/wiki/Graff_(jewellers)

    The Paragon is a 7-sided diamond of 137.82 carats (27.564 g), cut, [13] [14] and was worn as part of "millennium" necklace of round, pink, blue and yellow diamonds by Naomi Campbell in 1999. [ 15 ] The Lesotho Promise was acquired as a rough 603-carat (120.6 g) stone for $12.4 million in 2006. [ 16 ]

  7. Gemstone irradiation - Wikipedia

    en.wikipedia.org/wiki/Gemstone_irradiation

    Gemstone irradiation is a process in which a gemstone is exposed to artificial radiation in order to enhance its optical properties.High levels of ionizing radiation can change the atomic structure of the gemstone's crystal lattice, which in turn alters the optical properties within it. [1]

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