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In commercial diamond mining, a 'large' stone might be the size of a pea; a 'small' stone might be the size of a pinhead.

In terms of weight, a diamond the size of a pea, when cut and polished is about 6.5 mm at the girdle and weighs .20 grammes, or one carat.

Diamonds lose up to 60% of their raw weight when cut and polished.

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