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The Briolette of India is a colorless diamond (weighing 90.38 carats (18.076 g)) that was found in India. It is cut in a briolette shape, and is a D-coloured (colourless) type IIa diamond . [ 1 ] Its history was thought to date from the 12th century, when it was first acquired by Eleanor of Aquitaine , the Queen consort of King Louis VII of ...
A Lapidary or, The History of Precious Stones: With Cautions for the Undeceiving of all those that deal with Precious Stones (1 ed.). Cambridge: printed by Thomas Buck. p. 239. Note: it was written with the help of 'de Boodt's' book. Johann Martin Michaelis (1693).
Diamond also has a very high refractive index and a relatively high optical dispersion. Most natural diamonds have ages between 1 billion and 3.5 billion years. Most were formed at depths between 150 and 250 kilometres (93 and 155 mi) in the Earth's mantle, although a few have come from as deep as 800 kilometres (500 mi). Under high pressure ...
The British crown jewels contain the Cullinan Diamond, part of the largest gem-quality rough diamond ever found (1905), at 3,106.75 carats (621.35 g). A diamond solitaire engagement ring. Now popular in engagement rings, this usage dates back to the marriage of Maximilian I to Mary of Burgundy in 1477. [17]
A blue diamond with the same shape, size, and color as the Hope Diamond was recorded by John Francillon as in the possession of the London diamond merchant Daniel Eliason in September 1812, the earliest point when the history of the Hope Diamond can be definitively fixed, [14] [18] although a second, less definitive report claims that the Hope ...
Argyle diamond mine The open pit of the Argyle diamond mine. A large mining truck is visible on the road for scale. Location Argyle Diamond Mine Location in Australia Location Lake Argyle State Western Australia Country Australia Coordinates 16°42′44″S 128°23′51″E / 16.71222°S 128.39750°E / -16.71222; 128.39750 Production Products Diamonds History Opened 1985 Closed ...
The Portuguese Diamond at the Smithsonian National Museum of Natural History, the largest faceted diamond in that collection. 1928: Sold the 127-carat Portuguese Diamond for $373,000 to Hopkins Joyce. 1929: Black, Starr & Frost merged with Gorham Corporation, and was renamed Black, Starr, Frost-Gorham.
The Eureka Diamond was the first diamond discovered in South Africa. It originally weighed 21.25 carats (4.250 g), and was later cut to a 10.73-carat (2.146 g) cushion-shaped brilliant , which is currently on display at the Mine Museum in Kimberley .