Uncut diamonds that come from within the earth can have rough edges. Sometimes they are called 'rough' diamonds: more commonly raw diamonds, because they have not been cut and polished into gemstones.
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You can review the link below to view images of raw diamonds. Remember, about 80% of all diamonds mined are industrial diamonds and only 20% qualify as potential gemstones.
Demand of round diamonds is higher than any other cut, o demand and supply formaula exits. Round cut diamonds require more material to be removed from the rough diamond as compared to a fancy cut diamond. Naturally, this results in higher costs.
About 20% of all diamonds mined are gem-quality diamonds.
You may be thinking of gemstones and industrial diamonds. Gemstones represent about 20% of all diamonds mined, and the remainder is industrial diamonds.
Yes, diamonds can cut glass, because diamonds are harder than glass.