How to choose a marquise cut diamond: the ratios gemologists recommend, how to judge the bow-tie and outline, where inclusions hide, how big each carat looks and how to protect the points.

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How to choose a pear shaped diamond: the ratios most buyers prefer, what the bow-tie effect is, how to check symmetry, which way the point should face, and how big each carat looks.

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What an emerald cut diamond is, why its step facets show inclusions more easily, which length-to-width ratios most buyers prefer, and how big each carat weight looks.

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