![]() It refers to polished diamonds that weigh less than 20 points. One common trade term for weight is melee (which rhymes with jelly). Different industry segments~ mine production sorters, cutters, wholesalers and so forth~ often use different terms within their own groups. When diamond professionals communicate with each other, they describe weight in various ways. Others think it’s acceptable to use them more approximately if they’re clearly explained. ![]() Some jewelers feel that fractions should be used only when they’re exact. ![]() For example, a “quarter-carat” diamond might weigh from 23 to 29 points. In the diamond industry, however, weight fractions are used approximately, and they usually apply to ranges of weight. “One-quarter carat” is easier to understand than “twenty-five hundredths of a carat.” It’s also easier to say. Thus, you could say a 0.27-carat diamond weighs “twenty-seven hundredths of a carat” or “twenty-seven points.”ĭiamond weight can also be expressed in fractions, which are familiar and convenient. The weights of diamonds less than one carat can be stated in decimals or in points. For example, a diamond that weighs exactly 1 carat is recorded as 1.00 ct, and one that weighs exactly 1/4 carat is recorded as 0.25 ct. 100 points add up to one carat, just as 100 pennies add up to one dollar.Ĭarat weight is usually written in decimal numbers. One point (abbreviated pt) equals 0.01 carat, or 1/1000 carat. So the carat is subdivided into 100 equal parts called points. Fractions of a carat can represent hundreds~ eve thousands~ of dollars. It takes about 142 carats of diamonds to equal one ounce.Īs precise a unit as the carat is, it’s not precise enough for something as valuable as a diamond. In common US measurements, that’s 0.007 ounce (7/1000 ounce). One carat equals 0.200 gram, or 1/5 gram. The standard unit of weight for diamonds is the metric carat(abbreviated mct, or simply ct). Diamonds and other gemstones have their own unique system of weights, however. In recent years science and technology have also made the metric system of grams, milligrams and kilograms more familiar. Most Americans think of weight in terms of ounces, pounds and tons.
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