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2. 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 ]

3. Hope Diamond - Wikipedia

   en.wikipedia.org/wiki/Hope_Diamond

   The Hope Diamond is a 45.52 carats (9.104 g; 0.3211 oz) diamond that has been famed for its great size since the 18th century. Extracted in the 17th century from the Kollur Mine in Guntur, India, [1] [2] the Hope Diamond is a blue diamond.

4. 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]

5. Napoleon Diamond Necklace - Wikipedia

   en.wikipedia.org/wiki/Napoleon_Diamond_Necklace

   The Napoleon Diamond Necklace is somewhat atypical of other contemporary works produced by Marie-Étienne Nitot. [1] Other pieces commissioned from him by Emperor Napoleon, such as the two parures celebrating the Emperor's marriage to Archduchess Marie Louise of Austria, the Marie Louise Diadem, the wedding jewels for Empress Joséphine, etc., all demonstrate a predilection for highly ...

6. Diamond - Wikipedia

   en.wikipedia.org/wiki/Diamond

   Diamonds can be sold already set in jewelry, or sold unset ("loose"). According to the Rio Tinto, in 2002 the diamonds produced and released to the market were valued at US$9 billion as rough diamonds, US$14 billion after being cut and polished, US$28 billion in wholesale diamond jewelry, and US$57 billion in retail sales. [108]

7. Diamond simulant - Wikipedia

   en.wikipedia.org/wiki/Diamond_simulant

   A diamond simulant, diamond imitation or imitation diamond is an object or material with gemological characteristics similar to those of a diamond. Simulants are distinct from synthetic diamonds , which are actual diamonds exhibiting the same material properties as natural diamonds.