Surat Diamond
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Preferred Ratio for Emerald 

Emerald
L+W= 1.20 1.40 1.50 1.75 2.00

Preferred ratio: 1.50  |  Range: 1.495-1.655

The emerald cut looks most elegant at a 1.50 (or approximate range of 1.33 to 1.60) ratio. This outline emphasizes the beautiful parallel line facets and blocked corners.