

The oval diamond combines the brilliance of a round brilliant with an elongated silhouette that creates the illusion of greater size. It has surged in popularity over the past decade, becoming the second most requested shape for engagement rings.
Oval diamonds are known for very high brilliance with 58 facets. They're popular for engagement rings and halo settings. Here are the trade-offs.
A 1-carat oval diamond measures approximately 7.7 x 5.7 mm. Here are the most common sizes from 0.25 ct to 5 ct.
| Carat Weight | Size (mm) |
|---|---|
| 0.25 ct | 5 x 3.5 mm |
| 0.33 ct | 5.5 x 4 mm |
| 0.5 ct | 6 x 4.5 mm |
| 0.75 ct | 7 x 5 mm |
| 1 ct | 7.7 x 5.7 mm |
| 1.25 ct | 8 x 6 mm |
| 1.5 ct | 8.5 x 6.5 mm |
| 2 ct | 9 x 7 mm |
| 2.5 ct | 9.5 x 7.5 mm |
| 3 ct | 10.5 x 7.5 mm |
| 4 ct | 11.5 x 8.5 mm |
| 5 ct | 12.5 x 9 mm |
View full oval size chart → with all sizes from melee to 5+ carats.
Oval diamonds are priced at 15-25% less than round brilliant. Price depends on carat weight, color, clarity, and cut quality. For a personalized estimate, use our diamond price estimator.
Estimate oval diamond price →Last updated: 2026-07-16