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Carat
Diamonds and other gemstones are measured in carat weight. One carat equals 1/5th of a gram. You might hear the term points in reference to diamond weight. There are 100 points in a carat. For example, a 75 point = 0.75 carat.
The rough material for larger diamonds is more difficult to find than those for smaller diamonds. This affects the pricing structure of diamonds and for this reason larger diamonds generally cost more per carat. It is important to understand that the price per carat of diamonds rises proportionately with size. Prices per carat change at certain size thresholds.
For example, the price per carat will be less for a .90 F VS2 diamond than the price per carat for a 1.00 F VS2, which will be less than the price per carat for a 1.50 F VS2 diamond, even though the color and clarity are the same. If the diamond of your dreams is above your intended budget, you may want to think about purchasing a diamond of the same color and clarity just under the threshold of the weight that you have in mind.
NOTE: These images are not an exact representation of the corresponding carat
sizes
Example: ideal-cut .90 diamond will measure 6.2mm – 6.3 mm in diameter. A commercially cut 1 carat diamond will also measure 6.2mm – 6.3 mm in diameter. Be careful if you plan on buying a commercially cut stone. Physically you may be buying a diamond that weighs one carat, but visually you are getting a .90 diamond!! You may think that you are paying less per carat but in fact you are paying more, because you are paying a 1 carat price for a .90 stone.