The better the proportions of a diamond are, the more Fire, Sparkle, Scintillation, and Brilliance it will have. This also directly affects the price of the diamond. Ideal cut diamonds are rarer and cost more. Ideal cut round diamonds have a table % between 52 and 57%. There is no dimension on depth, but most people prefer the depth to be between 59 and 62.5% There is also another train of thought that believes that the perfect diamond has a 60-60 make. That means that the depth should be as close to 60% as possible with a few degrees variance either way, and the table should be as close to 60% with a couple of degrees variance either way being acceptable. Our take on it is this, while there is nothing more breathtaking than a textbook "ideal cut", you can save some money by going with a slightly off make. We suggest: Depth: 58-63% Table: 52-61%. If you stay within these parameters, you should end up with a very beautiful diamond. You can stray one or two degrees outside of these parameters, but the farther away from ideal you go, the more it starts to affect the beauty of the diamond. Below is a diagram of what happens when a diamond is out of shape. If the diamond is too deep or two shallow, the light will leak out of the diamond through the bottom instead of shining brightly back up into your eyes.
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