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Diamond's parent company changed names several times in the mid-twentieth century, first becoming Diamond Gardner in 1957 with the acquisition of Gardner Board and Carton Company, [13] followed by Diamond National in 1959 and Diamond International in 1964. The metal can manufacturer Heekin Can was acquired by Diamond International in 1965.
As of 2024, J.B. Nethercutt has the most Best of Show awards with 6 wins, while Bugatti and Mercedes-Benz are tied as the most successful marque with 10 wins each. [4] Since the beginning of the competition, only 7 post-war cars have won Best of Show.
Eventually sold to I. K. Gulland of London, where it was broken up into small pieces as industrial diamond drills. [7] 3106.75: Cullinan Diamond South Africa: Premier Mine: 1905: British Crown (I and II) and Charles III (III–IX) The largest gem-quality diamond ever discovered. 2492 [8] Motswedi Botswana: Karowe Mine [9] 2024: Lucara Diamond ...
Currently, gem production totals nearly 30 million carats (6.0 tonnes; 6.6 short tons) of cut and polished stones annually, and over 100 million carats (20 tonnes; 22 short tons) of mined diamonds are sold for industrial use each year, as are about 100 tonnes (110 short tons) of synthesized diamond.
[6] The first toothpick-manufacturing machine was developed in 1869, by Marc Signorello. Another was patented in 1872, by Silas Noble and J. P. Cooley. [7] Wooden toothpicks are cut from birch wood. Logs are first spiral cut into thin sheets, which are then cut, chopped, milled and bleached (to lighten) into the individual toothpicks. [8]
Every natural diamond crystal contains impurities and typical intrinsic or "self-defects": vacancies, dislocations, and interstitial atoms. The most common impurity in diamond is nitrogen, which can comprise up to 1% of a diamond by mass. Nitrogen as a diamond impurity was first identified in 1959 by Kaiser and Bond of Bell Telephone. [1]