Compared to the hardness of traditional abrasives, diamonds are also used as abrasives. Diamond has a Mohs hardness of 7,000, which is much higher than that of aluminum oxide and silicon carbide, making it more effective for processing hard materials. The earliest diamonds were obtained through mining. Natural diamonds can be classified based on their shape, color, and transparency, with the most perfect and flawless diamonds used for decorative gemstones, the next grade employed for industrial diamond tools, and the most common ones used as abrasive grit. In addition to naturally mined diamonds, many synthetic diamonds are also used in industry. Common methods of production include high-pressure high-temperature (HPHT) and chemical vapor deposition (CVD), with explosive methods being less commonly used.
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