While the shallow diamond will appear physically larger from above in jewelry store spotlights it’s not necessarily the best choice for those seeking the diamond which will appear the brightest and largest through multiple illumination environments. On a grading report it weights 1.00 carat with given measurements of 6.24-6.26 x 4.06 millimeters, making its spread 6.25 mm. It has deep angles which distribute weight more vertically. The right example is like the meatball above.
On a grading report it weighs 1.00 carat with given measurements of 6.44-6.46 x 3.80 millimeters, making its spread (average of length and width) 6.45 mm. The average of the first two numbers (length and width) are its spread, which becomes 6.65 mm. On a grading report it weighs 1.00 carat with given measurements of 6.64-6.66 x 3.80 millimeters. It has a shallow geometry for a round brilliant. The left example is like the pancake above.These measurements are important to take into account when comparing diamonds because, when looking down on the diamond from above, the spread is a more meaningful indication of its physical size-appearance to viewers than carat weight. Carat Weight and SpreadĪ diamond’s spread is its average width (or length and width for fancy shapes). Shallow shapes like emerald cuts, marquise and ovals can bring aesthetic benefit in terms of spread, but may not have the same dispersion or sparkle potential as deeper shapes. That means two diamonds of the same carat weight won’t always look the same size when mounted.ĭeep shapes like cushions and princess cuts frequently carry more weight in the body than round brilliants, so they will look physically smaller from the top. Just as people who weigh the same can have different shapes, so can diamonds. There are three underlying reasons for diamonds of the same carat weight to take on different size appearance to viewers.
From one jewelers’ scale to the next and the next, any diamond should weigh the same, to the hundredth of a carat. However, diamonds of the same carat weight can appear to be different sizes when viewed from above. It’s the only component of the 4Cs which is objectively and uniformly measured across the industry. But they occupy different surface-areas on the tray, because the meatball’s weight is distributed in a deeper vertical geometry than the pancake, where the weight is distributed horizontally.Ĭarat Weight is standardized. When you carry them to the table they weigh the same. On your kitchen scale they weigh the same. Imagine cooking a 1 pound meatball and a 1 pound pancake. This is because we typically view diamonds from a single direction: Above. Different 1.00 carat diamonds can look different sizes.
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