Diamond Size Chart
Radiant Diamond Size Chart
Radiant cut diamonds have trimmed corners and a brilliant cut style that blends round sparkle with an emerald-like outline.
Average Radiant Diamond Sizes
- 0.50 carat ≈ 5 x 4 mm
- 1.00 carat ≈ 6.5 x 5.5 mm
- 2.00 carat ≈ 8 x 7 mm
Tip: Rectangular radiants often look bigger than square ones of the same carat.
Select a diamond shape.
| MM Size | Carat Weight |
|---|---|
| 4.3x3 mm. | 0.25 ct. |
| 4.5x3.5 mm. | 0.34 ct. |
| 6x3 mm. | 0.41 ct. |
| 6x4 mm. | 0.50 ct. |
| 6.5x4.5 mm. | 0.75 ct. |
| 7x5 mm. | 1.00 ct. |
| 7.3x5.5 mm. | 1.25 ct. |
| 7.5x5.8 mm. | 1.50 ct. |
| 8x6 mm. | 1.75 ct. |
| MM Size | Carat Weight |
|---|---|
| 8.2x6.2 mm. | 2.00 ct. |
| 8.5x6.5 mm. | 2.25 ct. |
| 9x7 mm. | 2.50 ct. |
| 9.5x7.5 mm. | 3.00 ct. |
| 10x7 mm. | 3.31 ct. |
| 10x8 mm. | 3.50 ct. |
| 10.2x8.2 mm. | 4.00 ct. |
| 10.5x8.5 mm. | 4.50 ct. |
| 11x9 mm. | 5.00 ct. |
| MM Size | Carat Weight |
|---|---|
| 11.5x10 mm. | 6.45 ct. |
| 12x9 mm. | 6.06 ct. |
| 13x9 mm. | 6.54 ct. |
| 13.2x9.2 mm. | 6.79 ct. |
| 14x10 mm. | 8.47 ct. |
| 13x11 mm. | 9.33 ct. |
| 13.5x11.5 mm. | 10.19 ct. |
| 15x11 mm. | 11.48 ct. |
| 14x12 mm. | 12.14 ct. |
| 16x12 mm. | 14.22 ct. |
4cs of diamond guide
Begin your journey with our comprehensive online diamond education, and when you`re ready, our team of experts is here to answer your more detailed questions.
Loose Diamonds
Create an engagement ring that celebrates your love and lifelong commitment. At Brilliance, every ring is meticulously handcrafted by our skilled artisans just for you.
Why Customers Love Fascinating Diamonds
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Tim Calandrello
I was extremely happy with my entire experience and the jewelry is gorgeous. There was also really great communication with the company when I had questions. They were professional, responsive and a pleasure to deal with. The item arrived exactly when they said it would and I couldn't be happier. I'll absolutely order from them again.
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Bri
Beautiful, Excellent Communication
Excellent, quick, effective communication. The ring I picked out came out even more beautiful than I expected.
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Kevin M.
As always, Raj has given perfect
As always,Raj has given perfect product and service. I'm a customer for life
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Caroline Wooldridge
Raj was very communicative, empathetic and proactive in trying to help me with my mother's birthday gift. Would recommend! FYI, Im not a big jewelry buyer so was unfamiliar with these kind of stores/offices, but it's like a small office on high floor. He has a variety of samples/examples there, but most are ordered / custom (vs a full retail store.)
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Linda Courtney
The ring I received is lovely
The ring I received is lovely! There was an error to my order and they adjusted the difference promptly to my account. I would highly recommend this company!
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Cynthia T.
Will definitely buy from again.
Will definitely buy from again. Beautiful product, great communication, secure shipping.
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Kevin Mcknight
I received the very best customer service ever!!!! Raj was absolutely awesome. The diamond ring we purchased is beautiful and very well made. I will be a return client for many years and occasions. Just the best retail experience online!!!!
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FB
Great Purchase
Beautiful earrings and setting. Kind people that are always willing to answer questions.
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Mirander
good
remarkable pendant with exquisite design. I am in love....thank you
Frequently Asked Questions
Why are round diamonds considered the most popular shape?
Round diamonds are the most sought-after because of their unmatched brilliance and timeless look. Their symmetrical cut maximizes light reflection, making them sparkle more than any other shape.
How do I use the round diamond size chart?
The chart shows millimeter dimensions for each carat weight, helping you visualize how large your diamond will appear when set in a ring.
Do round diamonds look bigger than fancy shapes of the same carat?
Yes, round cuts often appear slightly larger due to their shallower depth and wider face-up area compared to deeper cuts like cushion or princess shapes.
What’s the ideal depth and table percentage for round diamonds?
A depth of 59–62.5% and a table between 54–58% are ideal for maximizing brilliance and fire.
What diamond size looks best on average finger sizes?
Round diamonds between 1.0 and 1.5 carats suit most hand sizes, offering the perfect balance between sparkle and comfort.
How does carat size affect the price of round diamonds?
Round cuts are the most expensive per carat since they lose the most rough diamond during cutting and are in the highest demand.
Do round diamonds hide inclusions better than other shapes?
Yes, their brilliant facet pattern helps disguise small imperfections better than step-cut diamonds like emerald or Asscher cuts.
What setting makes a round diamond appear larger?
Halo, bezel, or thin-band solitaire settings can enhance the stone’s presence and make it look bigger on the hand.
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