Diamond Carat Guide

Millimeter to Diamond Carat Weight Conversion Chart


Round Shape Cushoin Shape Radiant Shape Pear Shape Asscher Shape
Oval Shape Princess Shape Emerald Shape Marquise Shape  Heart Shape  





Round

Classic and brilliant, round cut stones are a popular choice for engagement rings in both traditional and modern settings. | Shop Kobelli Round Centered Jewelry.
Approx. Millimeter
Approx. Carat Weight
4
0.25
5
0.5
6.5
1
7
1.25
7.5
1.5
8
2
9
2.5
9.5
3
9.7
3.5
10
4
10.5
4.5
11
5


Oval

Perhaps the second most popular diamond cut next to round, oval shapes are brilliant, slimming and arguably the most fashion forward choice for engagement rings. | Shop Kobelli Oval Bridal & Fine Fashion Jewelry.
Approx. Millimeter
Approx. Carat Weight
6.5 x 4.5
0.5
8 x 6
1
9 x 7
1.75
10 x 7
2
11 x 7.5
2.5
11.5 x 8
3
12.5 x 8.5
3.5
13 x 9
4
13.5 x 7
4.5
14 x 9.5
5


Cushion

One of the most unique stones on the market, as well as a Kobelli customer favorite, particularly on our halo rings, cushion cut stones are between a round brilliant, old mine and radiant, with rounded corners for a comfortable look and feel.

Cushion stones vary from elongated to squarish. Kobelli hand selects each of our cushion stones to best fit our designs for the most flattering outcome. | Shop Kobelli Cushion Wedding Jewelry.
Approx. Millimeter
Approx. Carat Weight
4.5
0.5
5.7
1
6.2
1.25
6.5
1.5
7.3
2
8
2.5
8.3
3
8.7
3.5
9
4
9.5
4.5
10
5


Princess

A traditional stone cut with remarkable brilliance and sparkle, princess cut diamonds are the square alternative of the round brilliant. | Shop Kobelli Princess Luxury Jewelry.
Approx. Millimeter
Approx. Carat Weight
4.4
0.5
5.5
1
5.9
1.25
6.3
1.5
7
2
7.5
2.5
8
3
8.3
3.5
8.7
4
9
4.5
9.3
5


Radiant

As the name implies, radiant cuts give off magnificent radiance and sparkle with its intricate faceting and stunning flair.

A popular choice for our custom orders, Kobelli customers are absolutely in love with this dazzling stone cut. | Shop the Kobelli Radiants.
Approx. Millimeter
Approx. Carat Weight
4.3
0.5
5.5
1
6
1.25
6.5
1.5
7
2
7.5
2.5
8
3
8.5
3.5
8.8
4
9
4.5
9.5
5


Emerald

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


Pear

Pear cut diamonds have long been loved for their royal ties and long, slender shape. A challenging stone to cut and set, pear cut jewelry requires absolute skill and perseverance to create. Our pear shape diamonds all come in brilliant-faceted cuts for the brightest sparkle. | Shop Kobelli Pear High Jewelry.
Approx. Millimeter
Approx. Carat Weight
7 x 4.5
0.5
9 x 5.5
1
9.5 x 6
1.25
10 x 6.5
1.5
11 x 7
2
12 x 7.5
2.5
13 x 8
3
13.5 x 8.5
3.5
14.5 x 9
4
15 x 7
4.5
15.5 x 9.5
5


Marquise

Elegant and rare, marquise cuts hold an air of grandiose extravagance. The slender shape elongates the hand and beautifully carries itself with a romantic flair. | Shop the Kobelli Marquise Collection.
Approx. Millimeter
Approx. Carat Weight
8 x 4
0.5
10.5 x 5.5
1
11.5 x 7
1.25
11.7 x 6
1.5
13 x 6.5
2
14 x 7
2.5
15 x 7.5
3
16 x 8
3.5
16.5 x 8.3
4
17.5 x 6.5
4.5
17.7 x 9
5


Asscher

Asscher cuts are among the most rare shapes on the market and make for a truly unique piece.

The hall of mirrors effect can be seen by looking into this mesmerizing stone, reminiscent of a lifetime of memories. | Shop the Kobelli Asscher Collection.
Approx. Millimeter
Approx. Carat Weight
4.4
0.5
5.5
1
6
1.25
6.3
1.5
7
2
7.5
2.5
8
3
8.3
3.5
8.6
4
9
4.5
9.7
5


Heart

The perfect piece for your sweetheart. Show your love with a classic heart shape. | Shop Kobelli's Heart Shaped Diamonds.
Approx. Millimeter
Approx. Carat Weight
5.5 x 5
0.5
7 x 6
1
7.6 x 6.5
1.25
8 x 7
1.5
9 x 8
2
9.5 x 8.5
2.5
10 x 9
3
10.5 x 9.5
3.5
11 x 10
4
11.5 x 7.5
4.5
12 x 10.5
5