Size guide
The one everyone pictures. On most fingers it covers half the finger width.
All 9 shapes at 1ct
Carat is a weight, not a size. Because shapes distribute weight differently, a 1ct oval covers a lot more finger than a 1ct round.
Round
6.4 × 6.4 mm
Oval
8.2 × 5.9 mm
Cushion
6.4 × 6.4 mm
Emerald
7.6 × 5.6 mm
Pear
8.5 × 5.6 mm
Radiant
7.1 × 6 mm
Princess
5.8 × 5.8 mm
Marquise
10 × 5 mm
Moval
9 × 4.7 mm
1 carat — spec table
| Shape | Length | Width | L/W ratio |
|---|---|---|---|
| Round | 6.4 mm | 6.4 mm | 1.00 |
| Oval | 8.2 mm | 5.9 mm | 1.39 |
| Cushion | 6.4 mm | 6.4 mm | 1.00 |
| Emerald | 7.6 mm | 5.6 mm | 1.36 |
| Pear | 8.5 mm | 5.6 mm | 1.52 |
| Radiant | 7.1 mm | 6 mm | 1.18 |
| Princess | 5.8 mm | 5.8 mm | 1.00 |
| Marquise | 10 mm | 5 mm | 2.00 |
| Moval | 9 mm | 4.7 mm | 1.91 |
Price feel
The benchmark. Presence without shouting.
Lab-grown
$1,000–$2,000
Same look, dramatically lower cost. Little to no resale value.
Natural
$5,000–$9,000
Higher upfront. Retains meaningful long-term value.