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  2. Tanzanite - Wikipedia

    en.wikipedia.org/wiki/Tanzanite

    Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania, in a very small mining area approximately 7 km (4.3 mi) long and 2 km (1.2 mi) wide [4] near the Mererani Hills. [5] Tanzanite is noted for its remarkably strong trichroism, appearing alternately blue, violet and burgundy depending on crystal orientation. [6]

  3. Jewellery - Wikipedia

    en.wikipedia.org/wiki/Jewellery

    Conversely, the jewellery industry in the early 20th century launched a campaign to popularise wedding rings for men, which caught on, as well as engagement rings for men, which did not, go so far as to create a false history and claim that the practice had medieval roots. By the mid-1940s, 85% of weddings in the U.S. featured a double-ring ...

  4. Jade - Wikipedia

    en.wikipedia.org/wiki/Jade

    Main jade producing countries. Jade is an umbrella term for two different types of decorative rocks used for jewelry or ornaments.Jade is often referred to by either of two different silicate mineral names: nephrite (a silicate of calcium and magnesium in the amphibole group of minerals), or jadeite (a silicate of sodium and aluminum in the pyroxene group of minerals). [1]

  5. Golconda diamonds - Wikipedia

    en.wikipedia.org/wiki/Golconda_diamonds

    Raw diamonds from the mines were typically transported to Golconda—now the western part of Hyderabad— [28]) for skilled lapidary, enhancement, further evaluation, and sale. [ 17 ] [ 19 ] [ 20 ] The art of macle , which is a form of rough diamond that is used to produce jewellery, was first developed in the Golconda region. [ 29 ]

  6. Vitreous enamel - Wikipedia

    en.wikipedia.org/wiki/Vitreous_enamel

    Gothic châsse; 1185–1200; champlevé enamel over copper gilded; height: 17.7 cm (7.0 in), width: 17.4 cm (6.9 in), depth: 10.1 cm (4.0 in). Vitreous enamel, also called porcelain enamel, is a material made by fusing powdered glass to a substrate by firing, usually between 750 and 850 °C (1,380 and 1,560 °F).

  7. List of diamonds - Wikipedia

    en.wikipedia.org/wiki/List_of_diamonds

    24.78-carat (4.956 g) A 24.78-carat Fancy Intense Pink diamond and, until the sale of the Sweet Josephine diamond in November 2015, it was the most expensive jewel ever sold at auction. Previously owned by Harry Winston and an unnamed private collector, and bought by Laurence Graff (November 2010). [31] —

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