Oval Diamond Size Chart + Weight Calculator

Wondering how big a 1-carat Oval Cut Diamond is or how much an 8x6mm Oval Cut Diamond weighs?

Then you have come to the right page as I have created a full chart and built a really easy-to-use calculator to help you get an idea of how much your Diamond weighs.

Quick Note: These are estimated weights only, the actual weight of your Diamond may be different depending on the proportions of the stone.

Oval Cut Diamond Weight Calculator

If you have the dimensions of your Diamond, you can use my free calculator below.

The calculator has been designed to automatically calculate the depth of the stone at 62% (which falls in the ideal range) but if you have this measurement, you can enter it in the box.

Oval Cut Size to Carat Chart

0.5 Carat = 6.5 x 4.4mm

0.75 Carats = 7.2 x 5.1mm

1 Carat = 7.8 x 5.7mm

2 Carat = 9.4 x 7.4mm

3 Carat = 10.6 x 8.5mm

Images are for illustration purposes only as it is very difficult to accurately represent image sizes on screens.

SizeWeight
5x3mm0.18ct
5x4mm0.31ct
6x4mm0.38ct
6x5mm0.58ct
7x5mm0.69ct
8x6mm1.13ct
9x6mm1.29ct
9x7mm1.72ct
10x8mm2.49ct
11x9mm3.46ct
SizeWeight
12x8mm3.07ct
12x10mm4.65ct
13x11mm6.08ct
14x10mm5.53ct
14x12mm7.79ct
15x12mm8.40ct
16x12mm9.04ct
16x14mm12.10ct
18x13mm12.00ct
20x15mm17.65ct

Creating a chart for oval cut sizes is very difficult due to the incredible number of length-to-width combinations that there are, for example, there are numerous combinations for a 1-carat oval cut, such as:

  • 7.8×5.7mm
  • 8×5.6mm
  • 8.5×5.4mm

But I have tried to include all of the popular calibrated sizes in the chart above and the calculator can be used if you have the length and width measurements of your Diamond.

And as with all size-to-weight charts, this should be used as a guide only as there are factors that impact the weight of an Oval Cut Diamond, including:

  • Girdle thickness
  • Length-to-width ratio
  • Pavilion angle
  • Whether the stone has wide shoulders

Another issue with doing weight estimation for Oval Cut Diamonds is that there aren’t any globally recognized ‘ideal’ proportions, which is why Oval Cut Diamonds aren’t given a cut grade by gem labs such as the GIA.

But I do hope that the chart and calculator are helpful in giving you and idea as to how much your Diamond might weigh.

If you want to check the size to weight of other Diamond shapes, then you can use my Diamond weight estimation calculator or check out my other size charts below:

Other Diamond Size Charts

I'm Paul Haywood FGA DGA, the owner and founder of Haywoods Gems, I'm a fully qualified Gemmologist and Diamond Grader from the Gemmological Association of Great Britain.

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