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Diamond Carat Weight

Diamond Carat Weight

Carat is a term that refers to the weight of a diamond. Before the twentieth century, diamonds were measured by using the carob seed that is small and uniform and served as a perfect counter weight to the diamond.
It is those original carob seeds which are the origin of the word carat we use today.The majority of diamonds used in jewelry and sold loose in the United States are one carat or less in weight.

The average engagement ring diamond sold in the US is less than 1/2ct in weight. When rough diamonds are cut and polished into finished diamonds, as much as 2/3rd of the total carat weight is lost. Because larger gem quality rough is found less frequently than smaller rough, a two carat diamond will be far more expensive than two one carat diamonds of the same quality.

A diamond will increase in weight much faster than it increases in actual "face-up" diameter. While an ideal cut one-carat diamond measures approximately 6.5mm in width, a diamond of twice its weight is only 8.2mm wide - less than a 30% increase. The graphic to the left helps demonstrate:

Which Carat Weight is Right for you?

When deciding on which carat size is best for you, there are many things to consider. First and foremost, however, are her expectations? Which of the Four C’s does she value most? Is her heart set on a full "one-carat", "vvs" clarity or perhaps "D" color? If you’re not sure, ask a close friend or relative for advice. When determining carat it's also helpful to consider things such as her own personal style, her finger size, and the limitations of the engagement ring.
This number has been laser inscribed on the diamond’s girdle allowing for verification of the stone without a mapping of inclusions. This has allowed G.I.A. not only to save money on issuing full reports on smaller diamonds but has also saved the necessary time needed in plotting a stone’s diagram.
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Related Links:

Certified Diamond Buying Guide 77057|  Diamond Carat Buying Guide |  Diamond Clarity Buying Guide |  Diamond Color Buying Guide |  Diamond Cut Buying Guide |  How to choose a Diamond |  Precious Metal Buying Guide