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Some gem-quality diamonds come from the ground in the shape of two pyramids joined at the base, with four 'faces' on each pyramid. This is an ideal, natural diamond. Very few natural diamonds are found with this ideal shape.

(Diamond as a precious mineral was probably first admired based on a human picking up such a stone, more than 5,000 years ago.)

Most diamonds as they are found, are mis-shapen with many faces. As well, only 25% of mined diamonds are of gem quality, the remainder are considered 'industrial diamonds' not suitable for processing as gemstones.

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13y ago

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