mm to Carat Stone Size Chart
Emerald-cut

One of the timeless classics, an emerald cut diamond has high clarity as the parallel step cuts display more color. Its beveled edges and mirror facets create a subtle look. The emerald diamond stone cut makes a vintage-looking engagement or wedding ring. Our stone sizing chart below shows the standard sizes and matching carat weights for emerald-cut diamonds to help you find your perfect fit. 

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Printable Size Chart

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Emerald Diamond Average Carat by Millimeter Conversions

Beloved for its Art Deco appeal, clean cuts and sharp appearance, emerald cut stones give off a breath of fresh air with its gleaming sparkle, unique from that of the more traditional cuts and just as stunning. | Shop Kobelli Emerald Shape Creations.
Approx. Millimeter
Approx. Carat Weight
5.5 x 4
0.5
7 x 4.5
1
7.5 x 5
1.25
8 x 5.5
1.5
8.5 x 6
2
9 x 6.5
2.5
9.7 x 7
3
10 x 7
3.5
10.7 x 7.5
4
11 x 6
4.5
11.5 x 8
5
Round-shape diamond

Round

Cushion-shape diamond

Cushion

Oval-shape diamond

Oval

Marquise-shape diamond

Marquise
Pear-shape diamond

Pear

Emerald-shape diamond

Emerald

Radiant-shape diamond

Radiant

Asscher-shape diamond

Asscher

FAQ

How much does a listed carat weight vary by?

All diamond weights may vary by 5% unless stated otherwise. One-of-a-kind products will showcase the exact weight of all stones.

Do moissanites weigh the same as diamonds?

Not quite - while the moissanite gemstone is technically slightly lighter in weight due to a lower density, the stones are most commonly marketed by their Diamond Equivalent Weight (DEW) in accordance to the millimeter size of the stone rather than the weight of the stone itself.

All of Kobelli's moissanite products will be listed with the Diamond Equivalent Weights (DEW). This allows for an identical dimensional look if you are to upgrade your existing moissanite center stone for a diamond.

What about other gemstones?

Gemstones, aside from moissanites, will be listed in accordance to either their millimeter size or their carat weight. Every stone type carries its own unique traits for density and depth.