Carat is a measure of weight, not size, so a stone's dimensions in millimetres are what decide how large it looks on a finger. This tool renders a diamond at true millimetre scale on a photograph of your own hand, calibrated against something whose size is already known — your ring size, or a bank card in the shot — and tells you whether the stone will physically fit a given setting.

Diamond size guides · Carat to millimetres · How big is a 1 carat diamond? · Ring size to finger width · Setting styles

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