The following are weight estimation tables. I thought you might find them useful:

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

Source: http://www.yourgemologist.com/Charts%20and%20Graphs/diamondweight.html

I have found this little sheet very handy for diamond values. All diamonds will have slight variations depending on their actual weight and cut.

http://images.amazon.com/media/i3d/01/actual-diamond-size.pdf

I have found this little sheet very handy for diamond values. All diamonds will have slight variations depending on their actual weight and cut.

http://images.amazon.com/media/i3d/01/actual-diamond-size.pdf

Can this please be a sticky?
Jessica! HELLLOOOO GIRL! HUGS!

Thanks for giving such a good chart.............i hope that this will be more helpful foe me. But, as every diamond has its own values so what to do that time.