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Cubic Zircons are often meant to mimic diamonds. Since CZs have a more dense specific gravity than diamond -- Wikipedia indicates at least 1.6 times that of diamond. This means that carat weight would be less for the CZ to equal the carat weight of a diamond, both being equal in size.

Using the number 15 indicates that you're looking for a large stone. In this case, you may want to go by measurement and not by carat weight. For example, a 15 carat, round diamond measures about 16.3mm across the diameter of the girdle.

Presenting the data in reverse, a 15 carat CZ will weigh 1.6 times more than a 15 carat diamond: so the equivalent size diamond in weight will be less than 15 carats.

Determining the carat weight of a CZ which is 16.3mm across at the girdle can be made by a jeweler who can weigh the CZ stone and give you its equivalent carat weight.

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