a diamond knife is often used for cutting glass
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16
As diamond is the hardest material ever, it can be used to cut any material(like glass).
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diamonds are harder than glasses... diamonds were considered as the hardest substances in nature...seventy-five percent of diamonds found are employed in industry, for cutting tools, drill bits and so forth.
ghostrecog:
Some times diamond knife are used to cut the diamonds . Sounds strange,but our history say so.
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