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What is Carat Weight And Size of Gemstones?

How are Sapphires measured?

Precious gemstones vary in density, for example when comparing a diamond and a sapphire of the same size, the sapphire will be heavier due to it's larger density. Gemstones are often classified by carats, which is a unit of weight, but for ease of selection and setting, size is a more useful measurement for sapphires, which we list in millimeters (mm). Our standard size for a round sapphire is 6 mm, which is approximately one carat. Download the chart below and print it out for your own reference when selecting the size.

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Sapphire and diamond actual size cut


These natural white sapphires demonstrate why the carat weight of a sapphire does not always equal the size in mm, these 3 Ceylon sapphires range from 2.54 ct to just over 3.75 cts even though each sapphire length and width are all almost identical.