At the girdle, this stone would measure about 6.5 mm.
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A round, brilliant cut diamond measuring 6.5 mm at the girdle weighs about one carat.
A diamond weighing .07 carats (7/100ths of a carat) measures about 2.7 mm if the diamond is cut in the round brilliant style.
1 carat = 6.5 mm
1 carat = 100 cents = 6.5 mm = solitaire
2 cm just like jamies thingy