Professional Oval Diamond Size Chart

Detailed Oval Cut Size Comparison From CT to MM / MM to CT by Gemologists

The modern rendition of the oval shaped diamond is among the highest sold diamond shapes in the world. While during its creation in its modern form in the 1960’s the goal was to create a hybrid of the pear and round cut, it has long since become independently successful. As a result, the need for quick and easy conversions of ct to mm and mm to carat is more important than ever.

The following Oval Diamond Size Charts will provide you with quick and easy access to the much needed conversion of Oval Diamond Carat Size to MM, and the other way around. It’s important to note that the Oval Shaped Diamond, along with other shapes like the Baguette, and Emerald, has different variants of length to width ratios, and as such has included the information in our charts to ensure maximum coverage and accuracy.

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Oval Cut Diamond Conversion Tool From CT to MM / MM to CT

0.04 - 1.15 cts.

OVAL CUT CARAT WEIGHT	OVAL CUT LENGTH MM SIZE	OVAL CUT WIDTH MM SIZE
0.04 - 0.07 ct	2.50 - 3.40 mm.	2.00 - 2.40 mm.
0.08 - 0.12 ct	3.40 - 4.80 mm.	2.40 - 3.00 mm.
0.13 - 0.17 ct	3.90 - 4.40 mm.	2.80 -3.10 mm.
0.18 - 0.22 ct	4.10 - 4.60 mm.	3.00 - 3.40 mm.
0.23 - 0.28 ct	4.50 - 5.10 mm.	3.30 - 3.60 mm.
0.30 - 0.37 ct	4.90 - 5.60 mm.	3.60 - 4.00 mm.
0.40 - 0.48 ct	5.60 - 6.00 mm.	4.00 - 4.40 mm.
0.50 - 0.58 ct	5.90 - 6.30 mm.	4.40 - 4.60 mm.
0.60 - 0.69 ct	6.30 - 6.70 mm.	4.60 - 4.80 mm.
0.70 -0.78 ct	6.60 - 6.80 mm.	4.80 - 5.20 mm.
0.80 - 0.88 ct	6.90 - 7.30 mm.	5.10 - 5.40 mm.
0.90 - 0.98 ct	7.20 - 7.80 mm.	5.20 - 5.50 mm.
1.00 - 1.15 ct	7.90 - 8.20 mm.	5.50 - 5.80 mm.

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1.20 to 1.15

OVAL CUT CARAT WEIGHT	OVAL CUT LENGTH MM SIZE	OVAL CUT WIDTH MM SIZE
1.20 - 1.27 ct	8.10 -8.30 mm.	6.00 - 6.10 mm.
1.30 - 1.45 ct	8.40 - 8.50 mm.	6.00 - 6.20 mm.
1.50 - 1.60 ct	8.50 - 8.80 mm.	6.20 -6.40 mm.
1.65 - 1.80 ct	8.90 - 9.60 mm.	6.60 - 6.80 mm.
2.00 - 2.30 ct	9.80 - 10.10 mm.	7.10 - 7.30 mm.
2.40 - 2.60 ct	10.30 -10.70 mm.	7.50 - 7.80 mm.
2.70 - 2.90 ct	10.70 - 11.00 mm.	7.80 - 7.90 mm.
3.00 - 3.30 ct	10.90 - 11.60 mm.	8.00 - 8.40mm.
3.40 - 3.60 ct	11.50 - 12.00 mm.	8.40 - 8.70 mm.
3.70 -3.90 ct	12.00 - 12.35 mm.	8.80 - 8.90 mm.
4.00 - 4.20 ct	12.25 - 12.50 mm.	8.80 - 9.00 mm.
4.40 - 4.70 ct	12.40 - 13.00 mm.	9.00 - 9.30 mm.
5.00 - 5.25 ct	13.00 - 13.60 mm.	9.40 - 9.70 mm.

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Oval Cut Diamond on Hand

An oval cut diamond shows its best qualities the moment you place it on the finger. The elongated shape stretches gracefully along the finger, creating a noticeable slimming and lengthening effect that many people find especially flattering regardless of finger size or shape.This cut offers outstanding spread, so the stone often looks significantly larger face up than its actual carat weight. The brilliant faceting produces bright flashes that travel smoothly from end to end, giving the oval a lively flowing sparkle that feels both elegant and dynamic in real life. The soft rounded ends add comfort and a timeless appeal that works beautifully for both solitaire rings and more elaborate designs.

The following image visualizes oval cut diamonds on hand from 0.75 to 3.00 carats across different finger sizes.

Many people love how it appears even larger and more dazzling in real life than the carat weight suggests, making it one of the most popular choices for engagement rings and statement jewelry.

What are the Ideal Proportions of an Oval Cut?

Like other fancy cuts, the Oval Shaped Diamond does not get graded by GIA. We’ve overcome this through personal experience in gemology and manufacturing, which has helped us establish our own guidelines to fil the gap and to ensure a method of differentiation between excellent cut oval diamonds and lower grades.

What is the Ideal Diamond Depth and Table for the Oval Cut?

Oval Cut Diamond Recommended Proportions Guide

	EXCELLENT	VERY GOOD	GOOD
Table - %	67% - 72%	59% - 66% or 73% - 75%	59% - 66% or 73% - 75%
Depth - %	64%	75%	58% - 63.9% or 75.1% - 80%
Girdle	Very Thin to -	Slightly Thick	Very Thin to Thick
Culet	None	Very Small	Small

What is the Ideal Oval Cut Diamond Length to Width Ratio?

The Length to Width Ratio if an Oval Cut Diamond is highly important factors. While personal tastes do play a factor in opting for a narrower or thicker stone for example, the following ratios are highly effective as a guideline to the most desirable oval shapes proportions and their recommended ratios.

	EXCELLENT	VERY GOOD	GOOD
Length To Width Ratio	1.00 - 1.03	1.30 - 1.34 or 1.51 - 1.55	1.25 - 1.29 or 1.56 - 1.60