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2. The dress - Wikipedia

   en.wikipedia.org/wiki/The_dress

   The original photograph of the dress. The dress was a 2015 online viral phenomenon centred on a photograph of a dress. Viewers disagreed on whether the dress was blue and black, or white and gold. The phenomenon revealed differences in human colour perception and became the subject of scientific investigations into neuroscience and vision science.

3. Golconda diamonds - Wikipedia

   en.wikipedia.org/wiki/Golconda_diamonds

   Golconda diamonds are mined in the Godavari-Krishna delta region of Andhra Pradesh, India. Golconda Fort in the western part of modern-day Hyderabad was a seat of the Golconda Sultanate and became an important centre for diamond enhancement, lapidary, and trading. Golconda diamonds are graded as Type IIa, are formed of pure carbon, are devoid ...

4. Diamond (gemstone) - Wikipedia

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

   Diamond[a] is a gemstone formed by cutting a raw diamond. Diamonds are one of the best-known and most sought-after gems, and they have been used as decorative items since ancient times. The hardness of diamond and its high dispersion of light —giving the diamond its characteristic "fire"—make it useful for industrial applications and ...

5. Jewels of Elizabeth II - Wikipedia

   en.wikipedia.org/wiki/Jewels_of_Elizabeth_II

   A diamond necklace made by Cartier in the 1930s. It was a wedding gift to Elizabeth on her wedding to Prince Philip from the last Nizam of Hyderabad, Mir Osman Ali Khan, in 1947. The Nizam's entire gift set for the future Queen of the United Kingdom included a diamond tiara and matching necklace, whose design was based on English roses.

6. Colored gold - Wikipedia

   en.wikipedia.org/wiki/Colored_gold

   Black gold is a type of gold used in jewelry. [13] [14] Black-colored gold can be produced by various methods: Patination by applying sulfur- and oxygen-containing compounds. Plasma-assisted chemical vapor deposition process involving amorphous carbon; Controlled oxidation of gold containing chromium or cobalt (e.g. 75% gold, 25% cobalt [3]).

7. Wittelsbach-Graff Diamond - Wikipedia

   en.wikipedia.org/wiki/Wittelsbach-Graff_Diamond

   US$ 80 million (June 2011) 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.