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The color produced is a blue to blue-green which penetrates the whole stone. Such diamonds are not annealed. The blue color can sometimes approach that of natural Type IIb diamonds, but the two are distinguished by the latter's semiconductive properties. As with most irradiated diamonds, most gamma ray-treated diamonds were originally tinted ...
Carbonado. Typically black, can be grey, various shades of green and brown sometimes mottled. Carbonado, commonly known as black diamond, is one of the toughest forms of natural diamond. It is an impure, high-density, micro-porous form of polycrystalline diamond consisting of diamond, graphite, and amorphous carbon, with minor crystalline ...
A snake-stone, also known as a viper's stone, snake's pearl, black stone, serpent-stone, or nagamani is an animal bone or stone used as folk medicine for snake bite in Africa, South America, India and Asia. The early Celtic era European adder stone is also called a snake stone, and is usually made from coloured glass, often with holes. Its ...
Present, dichroism or trichroism, depending on heat treatment. Tanzanite is the blue and violet variety of the mineral zoisite (a calcium aluminium hydroxyl sorosilicate ), caused by small amounts of vanadium. [3] Tanzanite belongs to the epidote mineral group. Tanzanite is only found in Simanjiro District of Manyara Region in Tanzania, in a ...
Cullinan Diamond. The Cullinan Diamond is the largest gem-quality rough diamond ever found, [2] weighing 3,106 carats (621.20 g), discovered at the Premier No.2 mine in Cullinan, South Africa, on 26 January 1905. It was named after Thomas Cullinan, the owner of the mine. In April 1905, it was put on sale in London, but despite considerable ...
The Marie Antoinette Diamond Earrings are a pair of diamond earrings on permanent display in the Smithsonian National Museum of Natural History in Washington, D.C., United States. They are so named for their assumed provenance: that they were commissioned by King Louis XVI of France for his wife, Queen Marie Antoinette.
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