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Eternity Band
Full Eternity Band
Curved Band
Plain Solid Band
Earring
Bracelets
Necklace
Diamond Size Guide Round
Size guide
Round Diamond Size Chart
See how carat weight translates into millimeter measurements for round diamonds.
Complete Round size chart
57 sizesDiameter (mm)Carat
0.8 mm0.0025 ct
1 mm0.005 ct
1.1 mm0.0067 ct
1.2 mm0.009 ct
1.25 mm0.01 ct
1.3 mm0.01 ct
1.5 mm0.015 ct
1.75 mm0.02 ct
1.8 mm0.025 ct
2 mm0.03 ct
2.2 mm0.04 ct
2.5 mm0.06 ct
2.75 mm0.08 ct
3 mm0.10 ct
3.25 mm0.14 ct
3.5 mm0.17 ct
3.75 mm0.21 ct
4 mm0.25 ct
4.25 mm0.28 ct
4.5 mm0.36 ct
4.75 mm0.44 ct
5.0 mm0.50 ct
5.25 mm0.56 ct
5.5 mm0.66 ct
5.75 mm0.75 ct
6 mm0.84 ct
6.25 mm0.93 ct
6.5 mm1.00 ct
6.8 mm1.25 ct
7 mm1.30 ct
7.3 mm1.50 ct
7.5 mm1.67 ct
7.75 mm1.75 ct
8 mm2.00 ct
8.25 mm2.11 ct
8.5 mm2.43 ct
8.7 mm2.50 ct
9 mm2.75 ct
9.1 mm3.00 ct
9.5 mm3.35 ct
9.75 mm3.50 ct
10 mm3.87 ct
10.25 mm4.00 ct
10.5 mm4.41 ct
10.75 mm4.50 ct
11 mm5.00 ct
11.25 mm5.49 ct
11.5 mm5.85 ct
12 mm6.84 ct
12.25 mm7.26 ct
12.5 mm7.36 ct
12.75 mm7.52 ct
13 mm8.51 ct
13.5 mm9.53 ct
14 mm10.49 ct
15 mm12.89 ct
16 mm16.06 ct
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Testimonials
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Your Journey, Our Purpose
See what our happy customers say about Trionza Diamond
Brittany Buckner
Love my ring!! It is GORGEOUS! Better than expected and fast shipping, quick response for customer service too! Highly recommend.
Sophia Miller
Amazing quality and perfect fit! Customer service was super helpful and guided me through everything. The packaging was also exquisite.
Emma Johnson
Absolutely stunning! The ring sparkles beautifully and is even better in real life! I've received so many compliments already.
