This sometimes leads to gems with unnecessarily heavy proportions. The price per carat for the smaller diamond is $7800, whereas the price per carat of the larger diamonds is $11500.īefore adoption of the standardised “ ideal cut”, gems were cut to retain the maximum carat weight of the finished gem. If you’d like to take a closer look, the blue circles in the image above show the difference in price between a diamond of 0.90-0.99 carats (left) and on of 1.00-1.49 carat (right), both of F colour and VVS2 clarity. Jewellers use it as a guideline when determining diamond prices. The jewellery industry standard for pricing diamonds is the The Rapaport Diamond Report. This is reflected in the price per carat: often there will be a marked price jump in the price per carat at a round number like the popular 1 carat mark, again at 1.50 carats, and so on. Gems are valued in price bands by carat weight. Why is carat weight important?Īs diamonds come in different shapes the total weight of a gem is the most objective way to measure its size. For example a 0.30 carat diamond, may also be referred to as 30 points or a 30-pointer. A diamond’s weight is usually indicated in carats, but you may also hear it mentioned as points when a diamond is smaller than 1 carat. One carat is equal to 200 milligrams, or 0.2 of a gram. The name carat is derived from the carob seed, which has been used since ancient times to measure a gem’s weight. But it is actually the weight of the gem that we measure in carat. Often people think that “carat” refers to a diamond’s size, and certainly the bigger the carat the larger the diamond.
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