An eighth of a diamond carat, if it is a round cut, measures about 3.2mm at the girdle.
A 20 carat diamond weighs 20 carats. If the diamond is a round brilliant cut, it measures about 17.6 mm at the girdle.
This is a relatively tiny diamond. Take it to a jeweler and ask for an evaluation.
The letters CT stand for carat, the weight measurement for diamonds. One full carat -- 1.00 CT -- weighs .02 grammes. A diamond weighing 0.010 carat equals one one-hundredth of a carat.
The designation .30 carats indicates that the diamond weighs 30/100ths of a carat. The mm size will depend on its cut.
If the diamond is an ideal emerald cut with these measurements, the diamond may weigh about one quarter of a carat. Otherwise, you have stated the diamond's 'big' size in measurements.
The diamond weighs .125 carats. Its mm measurements depend on the cut.
A 20 carat diamond weighs 20 carats. If the diamond is a round brilliant cut, it measures about 17.6 mm at the girdle.
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If the diamond is a round brilliant cut, it's slightly larger than 16.3MM, which is the measurement of a diamond weighing 15 carats.
The value of a diamond depends on its cut, its clarity, its colour and its carat weight. A local jeweler can give you the answer you want.
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Carats refers to weight, not size. You should ask for measurements. Two round diamonds of equal carat weight are not necessarily the same size. Also the shape is a factor. A 1.80 ct pear shape diamond can look much bigger than a 1.80 ct round cut diamond.