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For economic reasons, the growth of most synthetic diamonds is terminated when they reach a mass of 1 carat (200 mg) to 1.5 carats (300 mg). [ 40 ] In the 1950s, research started in the Soviet Union and the US on the growth of diamond by pyrolysis of hydrocarbon gases at the relatively low temperature of 800 °C (1,470 °F).
Typically a round brilliant 1.0-carat (200 mg) diamond should have a diameter of about 6.5 mm (0.26 in). Mathematically, the diameter in millimeters of a round brilliant should approximately equal to 6.5 times the cube root of carat weight, or 11.1 times the cube root of gram weight, or 1.4 times the cube root of point weight.
Sometimes the cutters compromise and accept lesser proportions and symmetry in order to avoid inclusions or to preserve carat weight, since the per-carat price of diamond is much higher when the stone is over one carat (200 mg). While the round brilliant cut is considered standard for diamond, with its shape and proportions nearly constant, the ...
In May 2009, a 7.03-carat (1.406 g) blue diamond fetched the highest price per carat ever paid for a diamond when it was sold at auction for 10.5 million Swiss francs (6.97 million euros, or US$9.5 million at the time). [59]
2 Spelling - "carat" versus "karat". 6 comments. 3 Volume? 4 Volume. 2 comments. 5 International. 1 comment. 6 initials for gold jewelry. 1 comment. 7 14 carat ...
He averaged 16.3 points, 6.2 rebounds, 2.4 assists, 2.1 steals and 1.7 blocks as a senior at Louisiana Tech, shooting 48.5% from the field and 41.4% from 3-point range on 3.1 attempts per game.
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