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| Round Brilliant
By far the most preferred, the round brilliant cut is the most optically brilliant because of its 360 degree symmetrical shape. In 1919, Marcel Tolkowsky defined specific angles and proportions to yield the most brilliant diamond, which form the basis for the modern “Ideal” designation. Round-brilliant diamonds are the only shape to have this ideal proportion defined. The least amount of metal around the stone is recommended. The goal is to hold it securely but not cover up too much of the diamond and block light from entering the stone.

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Princess
The princess cut is a modern classic of clean, square lines and beautiful sparkle. The princess cut was developed in the 1970's and is now second only to the round brilliant in popularity. The cutting of this diamond combines the step-cutting of the emerald cut with the triangular facets of the brilliant cut and is cut with right-angle corners. The princess cut works beautifully as a solitaire but also looks great paired with side stones, especially trillions or smaller princess-cut diamonds.
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Emerald
The Emerald-cut is among the most classic of diamond shapes. Its clean lines come from step-cutting, or parallel line facets. Length-to-width ratios should be considered when choosing an emerald cut: Usually a 1.50:1.00 ratio is preferred, meaning that the length of the stone should be about 1 ½ times the width of the diamond. Natural inclusions are easier to see in this cut, therefore it is recommended to choose a “clean” stone.

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Cushion
The cushion cut is a relatively rare (and more expensive) shape and is for someone who wants something few people possess. The modern cushion shape is based on an antique cushion cut, which is a combination of round and square outline with a softened square or “pillow” shape. As a solitaire, it makes a statement and also looks wonderful paired with side stones such as baguettes.

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