Can a diamond scratch a diamond, and if not, is there anything that can?

Senior Moments

Diamonds are the hardest gems. In gemological terms, hardness means resistance to scratching. A diamond can scratch other gems, but nothing can scratch a diamond except another diamond. Cutting and faceting of diamonds can be done only with other diamonds because only diamond can cut diamond. Their hardness also allows diamonds to take a high polish, which enhances their scintillation. http://www.jcrs.com/newsletters/2003/2003_10.htm Jan 05 04, 2:36 AM

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How many is the most carats you can get in a diamond? Which city is the "true" Diamond Capital of the world, and on what grounds can it claim that title? If a diamond is the hardest substance on Earth, and it takes a diamond to cut a diamond, how was the first diamond cut? What is a Black Diamond?

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