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On the other hand, the size of a .5 carat diamond is approximately 5.2mm. Even though the carat weight is 50% of a 1 carat stone, it doesnât face up twice as small! Likewise, the physical size of a 2 carat diamond (8.2mm diameter) isnât twice as big as that of a 1 carat diamond (6.5mm diameter). Hopefully, this clears up the misunderstanding of carat weight and actual sizes.
Example: Suppose you have a heart-shaped diamond whose length is 5 mm, and it width is equal to its length. If the depth of the stone is 3 mm, then its approximate carat weight can be estimated as follows: Related: See our selection of eye-clean diamonds that we've vetted for quality.