Nexus Diamond™ Alternatives
You’ve decided that you want to go with a lab created diamond simulant. Now it’s time to pick the shape, millimeter size, carat weight and more. Click on the the cut to view its mm to carat conversion chart.
Round
Princess
Asscher
Cushion
Oval
Radiant
Emerald
Pear
Heart
Marquise
Triangle
Trillion
Baguette
Tapered Baguette
Round Cut
MM Size | Carat Weight |
0.8 | 0.0025 |
1 | 0.005 |
1.12 | 0.0075 |
1.15 | 0.0067 |
1.25 | 0.01 |
1.3 | 0.01 |
1.5 | 0.015 |
1.75 | 0.02 |
1.8 | 0.025 |
2 | 0.03 |
2.25 | 0.04 |
2.5 | 0.06 |
2.75 | 0.08 |
3 | 0.11 |
3.25 | 0.14 |
3.5 | 0.17 |
3.75 | 0.21 |
4 | 0.25 |
4.25 | 0.28 |
4.5 | 0.36 |
4.75 | 0.44 |
5 | 0.46 |
5.25 | 0.56 |
5.5 | 0.66 |
5.75 | 0.76 |
6 | 0.84 |
6.25 | 0.93 |
6.5 | 1.03 |
6.75 | 1.24 |
MM Size | Carat Weight |
7 | 1.28 |
7.25 | 1.49 |
7.5 | 1.67 |
7.75 | 1.75 |
8 | 2.04 |
8.25 | 2.11 |
8.5 | 2.43 |
8.75 | 2.55 |
9 | 2.75 |
9.25 | 3.05 |
9.5 | 3.35 |
9.75 | 3.61 |
10 | 3.87 |
10.25 | 4.16 |
10.5 | 4.41 |
10.75 | 4.57 |
11 | 4.91 |
11.25 | 5.49 |
11.5 | 5.85 |
12 | 6.84 |
12.25 | 7.26 |
12.5 | 7.36 |
12.75 | 7.52 |
13 | 8.51 |
13.5 | 9.53 |
14 | 10.49 |
15 | 12.89 |
16 | 16.06 |
Princess / Square Cut
MM Size | Carat Weight |
1.5 | 0.015 |
1.75 | 0.03 |
2 | 0.06 |
2.25 | 0.08 |
2.5 | 0.1 |
2.75 | 0.13 |
3 | 0.18 |
3.25 | 0.26 |
3.5 | 0.29 |
3.75 | 0.31 |
4 | 0.39 |
4.25 | 0.44 |
4.5 | 0.56 |
4.75 | 0.64 |
5 | 0.71 |
5.25 | 0.75 |
5.5 | 0.99 |
5.75 | 1.11 |
6 | 1.24 |
6.25 | 1.39 |
MM Size | Carat Weight |
6.5 | 1.59 |
6.75 | 1.75 |
7 | 1.96 |
7.25 | 2.01 |
7.5 | 2.4 |
7.75 | 2.74 |
8 | 3.01 |
8.25 | 3.24 |
8.5 | 3.67 |
8.75 | 4.1 |
9 | 4.12 |
9.5 | 5.09 |
9.75 | 5.36 |
10 | 5.62 |
10.25 | 5.76 |
10.5 | 5.99 |
11 | 7.44 |
11.5 | 9.44 |
12 | 9.52 |
Asscher Cut
MM Size | Carat Weight |
4 | 0.39 |
4.5 | 0.56 |
5 | 0.71 |
5.5 | 0.99 |
6 | 1.24 |
6.5 | 1.59 |
7 | 1.96 |
7.5 | 2.4 |
MM Size | Carat Weight |
8 | 3.01 |
8.5 | 3.67 |
9 | 4.12 |
9.5 | 5.09 |
10 | 5.62 |
11 | 7.44 |
12 | 9.52 |
13 | 12.66 |
Marquise Cut
MM Size | Carat Weight |
3 x 1.5 | 0.025 |
3.5 x 1.75 | 0.065 |
3.5 x 2 | 0.07 |
3.75 x 1.75 | 0.11 |
4 x 2 | 0.1 |
4.25 x 2.25 | 0.12 |
5 x 2.5 | 0.14 |
5 x 3 | 0.2 |
5.5 x 2.75 | 0.16 |
5.5 x 3 | 0.18 |
6 x 3 | 0.25 |
6.5 x 3 | 0.23 |
7 x 3 | 0.3 |
7 x 3.5 | .35 |
7 x 4 | 3.4 |
7.5 x 3.5 | 0.33 |
8 x 4 | 0.47 |
9 x 4.5 | 0.71 |
MM Size | Carat Weight |
9 x 5 | 0.76 |
9.5 x 5 | 0.85 |
10 x 5 | 0.95 |
11 x 5.5 | 1.25 |
11.5 x 6 | 1.33 |
12 x 6 | 1.62 |
12 x 6.5 | 1.71 |
13 x 6.5 | 2.11 |
14 x 7 | 2.48 |
15 x 7.5 | 3.09 |
14 x 8 | 3 |
15 x 7 | 3.12 |
15 x 8 | 3.44 |
16 x 8 | 3.86 |
17 x 8.5 | 4.88 |
17.5 x 10 | 5.5 |
20 x 8 | 7.08 |
20 x 10 | 7.94 |
20 x 11 | 9.5 |
Radiant Cut
MM Size | Carat Weight |
4.5 x 3.5 | 0.34 |
5 x 3 | 0.31 |
6 x 3 | 0.41 |
6 x 4 | .60 |
6.5 x 4.5 | 0.83 |
7 x 5 | 1.14 |
7.25 x 5.25 | 1.24 |
7.5 x 5.5 | 1.47 |
8 x 6 | 1.74 |
8.5 x 6.5 | 2.25 |
9 x 7 | 2.62 |
9.5 x 7.5 | 3.18 |
10 x 7 | 3.31 |
MM Size | Carat Weight |
10 x 8 | 3.49 |
11 x 9 | 5.05 |
11.5 x 10 | 6.45 |
12 x 9 | 6.06 |
12 x 10 | 6.79 |
13 x 9 | 6.54 |
13 x 11 | 9.33 |
13.5 x 11.5 | 10.19 |
14 x 10 | 8.47 |
14 x 12 | 12.14 |
15 x 11 | 11.48 |
16 x 12 | 14.22 |
Cushion Cut
MM Size | Carat Weight |
4 | 0.25 |
4.5 | 0.36 |
5 | 0.46 |
5.25 | 0.56 |
5.5 | 0.66 |
5.75 | 0.76 |
6 | 0.84 |
6.25 | 0.93 |
6.5 | 1.03 |
6.75 | 1.24 |
7 | 1.28 |
7.5 | 1.67 |
MM Size | Carat Weight |
8 | 2.04 |
8.5 | 2.43 |
9 | 2.75 |
9.5 | 3.35 |
10 | 3.87 |
10.5 | 4.41 |
11 | 4.91 |
11.5 | 5.85 |
12 | 6.84 |
13 | 8.51 |
14 | 10.49 |
15 | 12.89 |
Pear Cut
MM Size | Carat Weight |
3 x 2 | 0.13 |
4 x 2.5 | 0.18 |
4 x 3 | 0.21 |
5 x 3 | 0.25 |
5 x 4 | 0.35 |
6 x 4 | 0.39 |
6.5 x 4.5 | 0.57 |
7 x 5 | 0.71 |
8 x 5 | 0.81 |
8.5 x 5.5 | 1.08 |
8 x 6 | 1.25 |
9 x 6 | 1.33 |
9 x 7 | 1.75 |
10 x 6 | 1.71 |
10 x 7 | 1.8 |
10 x 8 | 2.46 |
11 x 7.50 | 2.61 |
11 x 8 | 3 |
12 x 7 | 3.12 |
MM Size | Carat Weight |
12 x 8 | 3 |
12 x 9 | 3.44 |
13 x 8 | 2.98 |
14 x 8 | 3.47 |
13 x 9 | 4.11 |
14 x 9 | 4.25 |
15 x 9 | 5.06 |
14 x 10 | 5.41 |
13 x 11 | 5.65 |
15 x 10 | 5.75 |
15 x 11 | 7.36 |
16 x 9 | 5.86 |
16 x 10 | 6.27 |
16 x 12 | 8.99 |
17 x 10 | 6.46 |
18 x 11 | 8.14 |
18 x 12 | 9.35 |
18 x 13 | 10.21 |
Oval Cut
MM Size | Carat Weight |
4.5 x 3.5 | 0.21 |
5 x 3 | 0.21 |
5 x 4 | 0.35 |
5.5 x 3.5 | 0.33 |
6 x 4 | 0.43 |
6.5 x 4.5 | 0.65 |
6 x 5 | 0.61 |
7 x 5 | 0.76 |
7.5 x 5.5 | 0.98 |
8 x 6 | 1.21 |
8.5 x 6.5 | 1.46 |
9 x 6 | 1.41 |
9 x 7 | 1.86 |
MM Size | Carat Weight |
10 x 8 | 2.54 |
10.5 x 8.5 | 2.88 |
11 x 9 | 3.85 |
12 x 8 | 2.99 |
12 x 10 | 5.05 |
14 x 10 | 5.81 |
13 x 11 | 6.05 |
14 x 12 | 8.21 |
15 x 12 | 8.76 |
16 x 12 | 9.32 |
16 x 14 | 11.88 |
18 x 13 | 12.86 |
20 x 15 | 14.96 |
Heart Cut
MM Size | Carat Weight |
3.5 | 0.18 |
4 | 0.25 |
4.25 | 0.28 |
4.5 | 0.34 |
4.75 | 0.38 |
5 | 0.44 |
5.5 | 0.61 |
6 | 0.74 |
6.25 | 0.83 |
6.5 | 0.93 |
7 | 1.13 |
7.5 | 1.59 |
MM Size | Carat Weight |
8 | 1.71 |
9 | 2.41 |
9.5 | 2.9 |
10 | 3.16 |
11 | 4.41 |
12 | 5.66 |
13 | 7.88 |
14 | 9.38 |
15 | 10.79 |
16 | 13.27 |
18 | 15.33 |
Trillion Cut
MM Size | Carat Weight |
3 | 0.12 |
3.5 | 0.16 |
3.75 | 0.19 |
4 | 0.23 |
4.25 | 0.27 |
4.5 | 0.31 |
4.75 | 0.37 |
5 | 0.42 |
5.25 | 0.49 |
5.5 | 0.55 |
5.75 | 0.64 |
6 | 0.7 |
MM Size | Carat Weight |
6.25 | 0.75 |
6.5 | 0.91 |
6.75 | 0.98 |
7 | 1.1 |
7.5 | 1.21 |
8 | 1.75 |
9 | 2.35 |
11 | 3.66 |
12 | 4.9 |
13 | 6.42 |
15 | 9 |
Emerald Cut
MM Size | Carat Weight |
3 x 2 | 0.1 |
3.5 x 2 | 0.12 |
4 x 2 | 0.15 |
4 x 3 | 0.2 |
5 x 3 | 0.29 |
5.5 x 3.5 | 0.46 |
5.5 x 4 | 0.48 |
6 x 4 | 0.66 |
6.5 x 4.5 | 0.88 |
7 x 5 | 1.06 |
7.25 x 5.25 | 1.24 |
7.5 x 5.5 | 1.45 |
8 x 6 | 1.74 |
8.5 x 6.5 | 2.17 |
MM Size | Carat Weight |
9 x 7 | 2.62 |
9.5 x 7.5 | 3.21 |
10 x 7 | 3.01 |
10 x 8 | 3.79 |
11 x 9 | 5.21 |
12 x 8 | 5.34 |
12 x 10 | 6 |
13 x 9 | 6.38 |
14 x 8 | 6.25 |
14 x 10 | 8.48 |
13 x 11 | 9.13 |
14 x 12 | 11.26 |
16 x 12 | 14.22 |
Triangle Cut
MM Size | Carat Weight |
2.5 | 0.08 |
3 | 0.12 |
3.5 | 0.18 |
4 | 0.25 |
4.25 | 0.32 |
4.5 | 0.37 |
4.75 | 0.42 |
5 | 0.45 |
5.25 | 0.53 |
5.5 | 0.66 |
5.75 | 0.71 |
6 | 0.76 |
6.25 | 0.86 |
6.5 | 0.94 |
6.75 | 1.02 |
MM Size | Carat Weight |
7 | 1.11 |
7.25 | 1.32 |
7.5 | 1.45 |
7.75 | 1.69 |
8 | 1.79 |
8.25 | 1.86 |
9 | 2.15 |
9.25 | 2.54 |
9.75 | 3.25 |
10 | 3.52 |
11 | 4.74 |
12 | 6.03 |
13 | 8.12 |
14 | 9.83 |
Baguette Tapered Cut
MM Size | Carat Weight |
2 x 1.5 x 1 | 0.025 |
2.5 x 1.5 x 1 | 0.035 |
2.5 x 1.75 x 1 | 0.04 |
3 x 1.5 x 1 | 0.05 |
3 x 1.75 x 1.25 | 0.055 |
3 x 1.75 x 1.3 | 0.055 |
3 x 1.75 x 1.5 | 0.055 |
3 x 2 x 1 | 0.06 |
3 x 2 x 1.25 | 0.065 |
3 x 2 x 1.5 | 0.07 |
3 x 2 x 1.75 | 0.075 |
3 x 2.5 x 2 | 0.08 |
3.25 x 1.75 x 1 | 0.07 |
3.25 x 1.75 x 1.25 | 0.05 |
3.5 x 1.25 x 1 | 0.04 |
3.5 x 1.5 x 1 | 0.05 |
3.5 x 1.5 x 1.25 | 0.055 |
3.5 x 1.7 x 1.3 | 0.055 |
3.5 x 1.75 x 1 | 0.06 |
3.5 x 1.75 x 1.25 | 0.07 |
3.5 x 1.75 x 1.3 | 0.065 |
3.5 x 2 x 1.25 | 0.08 |
3.5 x 2 x 1.5 | 0.09 |
3.5 x 2.5 x 2 | 0.09 |
3.75 x 2 x 1.25 | 0.08 |
4 x 1.5 x 1 | 0.07 |
4 x 1.5 x 1.2 | 0.08 |
4 x 1.75 x 1.25 | 0.08 |
4 x 2 x 1.5 | 0.1 |
4 x 2.5 x 1.5 | 0.12 |
4 x 2.5 x 2 | 0.21 |
4 x 3 x 2 | 0.21 |
4.25 x 2 x 1.25 | 0.11 |
MM Size | Carat Weight |
4.25 x 2 x 1.5 | 0.13 |
4.25 x 2.5 x 1.25 | 0.13 |
4.25 x 2.5 x 1.5 | 0.135 |
4.5 x 1.75 x 1.25 | 0.15 |
4.5 x 2 x 1.5 | 0.12 |
4.5 x 2.3 x 1.8 | 0.16 |
4.5 x 2.5 x 2 | 0.15 |
4.5 x 2.75 x 1.75 | 0.15 |
4.5 x 3 x 2 | 0.16 |
4.5 x 3 x 2.5 | 0.16 |
4.75 x 2.5 x 1.5 | 0.15 |
4.75 x 3 x 2 | 0.18 |
5 x 2 x 1 | 0.14 |
5 x 2 x 1.25 | 0.15 |
5 x 2 x 1.5 | 0.15 |
5 x 2.3 x 1.8 | 0.16 |
5 x 2.5 x 1.5 | 0.2 |
5 x 2.5 x 2 | 0.21 |
5 x 2.75 x 2 | 0.21 |
5 x 3 x 2 | 0.25 |
5 x 3.5 x 2 | 0.26 |
5 x 4 x 3.5 | 0.28 |
5.5 x 2 x 1.5 | 0.18 |
5.5 x 2.5 x 1.75 | 0.23 |
5.5 x 2.5 x 2 | 0.23 |
5.5 x 3 x 2 | 0.26 |
5.5 x 3 x 2.25 | 0.26 |
5.5 x 4 x 2.5 | 0.28 |
6 x 2 x 1.5 | 0.3 |
6 x 2.5 x 1.5 | 0.3 |
6 x 3 x 2 | 0.3 |
6.5 x 2.5 x 2 | 0.3 |
6.5 x 3 x 2 | 0.32 |
Baguette Straight Cut
MM Size | Carat Weight |
2 x 1 | 0.02 |
2 x 1.5 | 0.04 |
2 x 1.75 | 0.04 |
2.25 x 1.75 | 0.04 |
2.25 x 2 | 0.045 |
2.5 x 1 | 0.045 |
2.5 x 1.25 | 0.047 |
2.5 x 1.5 | 0.05 |
2.5 x 1.75 | 0.055 |
2.5 x 2 | 0.055 |
2.75 x 1.5 | 0.055 |
2.75 x 1.75 | 0.06 |
2.75 x 2 | 0.06 |
2.75 x 2.5 | 0.065 |
3 x 1 | 0.05 |
3 x 1.25 | 0.055 |
3 x 1.5 | 0.06 |
3 x 1.75 | 0.08 |
3 x 2 | 0.1 |
3 x 2.5 | 0.13 |
3.25 x 1.25 | 0.06 |
3.25 x 1.5 | 0.065 |
3.25 x 1.75 | 0.08 |
3.25 x 2.5 | 0.14 |
3.5 x 1 | 0.065 |
3.5 x 1.25 | 0.07 |
3.5 x 1.5 | 0.07 |
3.5 x 1.75 | 0.08 |
3.5 x 2 | 0.13 |
3.5 x 2.5 | 0.15 |
3.5 x 3 | 0.15 |
MM Size | Carat Weight |
3.75 x 1.5 | 0.14 |
3.75 x 2 | 0.145 |
4 x 1.25 | 0.075 |
4 x 1.5 | 0.08 |
4 x 1.75 | 0.11 |
4 x 2 | 0.14 |
4 x 3 | 0.2 |
4.5 x 1.5 | 0.1 |
4.5 x 1.75 | 0.14 |
4.5 x 2 | 0.17 |
4.5 x 2.5 | 0.2 |
4.5 x 3 | 0.285 |
4.5 x 3.5 | 0.3 |
4.75 x 1.5 | 0.27 |
4.75 x 2 | 0.28 |
5 x 1.5 | 0.14 |
5 x 1.75 | 0.15 |
5 x 2 | 0.19 |
5 x 2.5 | 0.24 |
5 x 3 | 0.3 |
5 x 3.5 | 0.33 |
5 x 4 | 0.4 |
5.5 x 1.75 | 0.16 |
5.5 x 2 | 0.18 |
5.5 x 2.5 | 0.23 |
5.5 x 3 | 0.3 |
5.5 x 3.5 | 0.33 |
6 x 1.75 | 0.28 |
6 x 2 | 0.3 |
6 x 2.5 | 0.33 |
6 x 3 | 0.4 |
Designing an engagement ring is quick and easy with this diamond size chart. The first thing that you’ll need to do is to choose your desired shape. Each shape has a unique style, brilliance and meaning.
After you decide on the right shape, it’s time to choose on the perfect carat size for you. Whether you want a round cut, cushion cut, oval, asscher, emerald, heart, or princess cut diamond alternative, we have it here for you.
If chemistry matters to you and you want a lab grown diamond, check out our sister company 12FIFTEEN Diamonds!