A 5 carat round diamond is about 11.00 mm across. The same weight is 13.3 × 9.9 mm as an oval, 9.5 mm as a princess, 11.9 × 8.5 mm as an emerald cut and 17.9 × 9.0 mm as a marquise. Each cut is drawn at true 1:1 size on a finger below.
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| Actions | |||||||
|---|---|---|---|---|---|---|---|
| 11.00 | 1 : 1 | 6.77 | 95.1 | 67% | 58% | ||
| 13.33 × 9.88 | 1.35 : 1 | 6.12 | 103.4 | 60% | 52% | ||
| 11.88 × 8.48 | 1.4 : 1 | 5.51 | 97.1 | 51% | 45% | ||
| 15.15 × 9.47 | 1.6 : 1 | 5.87 | 100.9 | 57% | 50% | ||
| 10.45 × 9.50 | 1.1 : 1 | 6.18 | 93.2 | 58% | 50% | ||
| 9.51 | 1 : 1 | 6.66 | 90.5 | 58% | 50% | ||
| 17.91 × 8.96 | 2 : 1 | 5.37 | 112.1 | 54% | 47% | ||
| 11.30 × 9.04 | 1.25 : 1 | 5.97 | 99.8 | 55% | 48% |
| Actions | ||||
|---|---|---|---|---|
| 3.52 | 11.00 mm | 5.00 ct | ||
| 3.21 | 11.35 mm | 4.56 ct | ||
| 4.00 | 10.55 mm | 5.68 ct | ||
| 2.72 | 11.99 mm | 3.86 ct |
05 / Field guide
What 5 carat looks like in millimetres: every cut at standard proportions, on fingers of different sizes, against the weights either side and in other stones. Sizes are estimates from the trade formulas; a real stone varies with its cut.
5 carat is 1000 mg. As a round brilliant at a 61.5% depth it is 11.00 mm across and about 6.77 mm deep. marquise (17.9 × 9.0 mm), oval (13.3 × 9.9 mm), pear (15.1 × 9.5 mm) spread the same weight over the largest outlines; the princess (9.5 mm) faces up smallest because more of its weight sits below the girdle.
Face-up, the marquise covers 112.1 mm² against 90.5 mm² for the princess, 24% more for the same 5 carats.
A 11.00 mm round covers about 70% of the width of a US 5 finger (15.7 mm), 64% of a US 7 and 56% of a US 10. On most fingers it reaches past the edges of the band and reads as a large stone. Set the finger chips to your own size to see it drawn at 1:1.
Up from 4 ct (10.22 mm), the stone is 8% wider. Above 5 carats, each extra carat adds less and less width.
Density changes the size of a stone of the same weight. 5 ct of moissanite (SG 3.21) is about 11.35 mm round, sapphire or ruby (SG 4.00) 10.55 mm and emerald (SG 2.72) 11.99 mm, against 11.00 mm for diamond. Moissanite is usually sold by diamond equivalent weight, so a “5 ct DEW” moissanite is cut to the 11.00 mm diamond size and weighs about 4.56 ct.
Questions
About 11.00 mm across as a round brilliant. As an oval it is about 13.3 × 9.9 mm, a princess 9.5 mm, an emerald cut 11.9 × 8.5 mm and a cushion 10.5 × 9.5 mm.
The marquise, at 17.9 × 9.0 mm with 112.1 mm² face-up. The princess looks smallest at 9.5 mm.
Sold by diamond equivalent weight, it is the diamond size, 11.00 mm round, and weighs about 4.56 ct. A moissanite weighing a true 5 ct is about 11.35 mm.
A 11.00 mm round covers about 67% of the 16.5 mm width of a US 6 finger.