Surat Diamond
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Preferred Ratio for Radiant 

Radiant
L+W= 1.10 1.20 1.40 1.60 1.80

Preferred ratio: 1.40  |  Range: 1.275-1.445

Radiant cut diamonds are usually cut to a slightly rectangular outline, with an optimum length to width ratio around 1.40. If you prefer a longer, narrower silhouette look for 1.50 to 2.00. For a square outline, look for a ratio of 1.00 or 1.10.