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The Winston Blue is the name given to what was the largest flawless vivid blue diamond [1] [4] [5] bought by Harry Winston, Inc. (a wholly owned subsidiary of The Swatch Group from January 2013) on May 15, 2014, from an anonymous person for $23.8 million at Christie's Geneva Magnificent Jewels sale. The approximately $1.8003 million per carat ...
On 10 December 2008, the 35.56-carat (7.112 g) Wittelsbach Diamond was sold to London-based jeweller Laurence Graff for £16.4 million sterling, or US$23.4 million, at the time the highest price ever paid at auction for a diamond. (The previous record had been held by a pear-shaped 100-carat (20 g) stone named the Star of the Season.) The ...
in rose diamonds surrounded by a wreath of trefoils in emeralds, the whole enclosed by a circle of large single Brazilian stones of the finest water, surmounted by a crowned harp in diamonds and loop, also in Brazilian stones. Total size of oval 3 by 2 + 3 ⁄ 8 inches; height 5 + 5 ⁄ 8 inches. Value £16,000. (equivalent to £2,140,000 in 2023).
The Golconda diamondiferous region is located in the Southern Indian peninsular shield, [2] which was formed during the process of proterozoic and Insular India. [3] The region is spread over 50,000 km 2 (19,000 sq mi), within the sediments of the Krishna-Pennar river basin and Deccan Traps, [2] and contains 120 out of the 150 kimberlite pipes in India. [4]
The original rough diamond was found in 1966 in the Premier Mine in South Africa, weighing 241 carats (48.2 g). Harry Winston cut it into the shape of a pear weighing 69.42 carats (13.884 g). [1] At the time of sale in 1969, the diamond was set in a platinum ring with two smaller diamonds on either side. [2]
[2] In 1953 the GIA developed its International Diamond Grading System and the "four Cs" (cut, clarity, color, and carat weight) as a standard to compare and evaluate the quality of diamonds. [2] As of 2024, the institute is headquartered in Carlsbad, California, and operates in 13 countries, with 11 campuses, 9 laboratories, and 4 research ...
[1] [2] They are not diamonds; the "diamond" in their name is due to both their clarity and well-formed faces. Because the first discovery sites were in the village of Middleville and in the city of Little Falls , respectively, the crystal is also known as a Middleville diamond or a Little Falls diamond .
The Star of Adam is an oval-shaped blue star sapphire, currently the largest star sapphire in the world. [1] [2] [3] It weighs 1,404.49 carats (280.898 g; 9.9084 oz). [4]Prior to its discovery in 2015, the Black Star of Queensland, weighing 733 carats (146.6 g), was the largest star sapphire gem in the world.