You can take your loose stone or diamond-set jewelry to a certified gemologist, who removes the stone and weighs it. The gemologist will document the carat weight of the stone.
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Carats is a weight measurement for diamond, so your answer depends on how much your diamond weighs. Karats is a purity measurement for gold. Carrots grow in your vegetable garden.
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.
45.52 carats
paragon
A one carat diamond -- 1.00 carats -- weighs .20 grams. Can you do the math?