Size guide

What a 4 carat diamond actually looks like on your hand.

Statement territory. Wants a lifted setting so it doesn't overwhelm the hand.

All 9 shapes at 4ct

Same carat weight. Very different footprint.

Carat is a weight, not a size. Because shapes distribute weight differently, a 4ct oval covers a lot more finger than a 4ct round.

Round

10.2 × 10.2 mm

Oval

13.6 × 9.4 mm

Cushion

10.1 × 10.1 mm

Emerald

12.8 × 9 mm

Pear

14.2 × 8.8 mm

Radiant

11.8 × 9.2 mm

Princess

9.3 × 9.3 mm

Marquise

16.3 × 8.2 mm

Moval

14.7 × 7.7 mm

4 carat — spec table

Shape	Length	Width	L/W ratio
Round	10.2 mm	10.2 mm	1.00
Oval	13.6 mm	9.4 mm	1.45
Cushion	10.1 mm	10.1 mm	1.00
Emerald	12.8 mm	9 mm	1.42
Pear	14.2 mm	8.8 mm	1.61
Radiant	11.8 mm	9.2 mm	1.28
Princess	9.3 mm	9.3 mm	1.00
Marquise	16.3 mm	8.2 mm	1.99
Moval	14.7 mm	7.7 mm	1.91

Price feel

Massive. Rare, and looks it.

Lab-grown

$10,000–$16,000

Same look, dramatically lower cost. Little to no resale value.

Natural

$85,000–$150,000+

Higher upfront. Retains meaningful long-term value.

True-to-scale, in every shape, in seconds.

Other sizes