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    How is rough uncut diamond "refined"?

    According to Shan Chongxin, a professor at Zhengda University, diamond is made of carbon element under the special conditions of high temperature and high pressure deep in the earth, plus a certain content and ratio of iron group metals as catalysts, after hundreds of millions of years of "cultivation". And artificially cultivated diamonds can shorten this time to two or three weeks, just like planting flowers and plants, "growing" it in the laboratory.

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