Diamond Weight Estimation Table
  To obtain approximate weights of the following diamond shapes multiply by the following measurements to millimeters. To obtain length to width ratio divide the length by the width. The measurements estimations below are based on diamonds cut to Class II proportioning or better. Diamonds with poor makes will vary in actual weights.
 

 
Rounds = ..........................Diameter x Diameter x Depth x .0061
Ovals = ..............................Length x width x Depth x .0062
Princess Cuts = ..............Length x width x depth x .0083
Heart Cuts = ...................Length x width x depth x .0059

Triangle Cut = ...............Length x width x depth x .0057

Emerald Cut = ...............Length x width x depth x factor:

Factor.....Length to width ratio
.0080 1.00 : 1
.0092 1.50 : 1
.0100  2.00 : 1
.0106 2.50 : 1

Marquise Cut = .............Length x width x depth x factor:

Factor............Length to width ratio
 .00565 1.50 : 1
.00580 2.00 : 1
.00585  2.50 : 1
.00595 3.00 : 1

 Pear Cut = ......................Length x width x depth x factor:

Factor........Length to width ratio
 .00615  1.25 : 1
.00600 1.50 : 1
.00590  1.66 : 1
.00575 2.00 : 1
 

  For more information, please visit the International School of Gemology website
 

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