

Oval Diamond
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.
Is a oval diamond a good choice?
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.
Why people love it
- +Looks about 10% larger than a round of the same carat weight
- +Elongated shape creates a flattering, finger-lengthening effect
- +15-25% less expensive than equivalent round brilliants
- +Excellent brilliance, comparable to round in well-cut stones
- +Modern and fashionable while still being a timeless choice
Things to know
- −Most ovals show some bow-tie shadow. Severity varies with cut quality.
- −No standardized cut grade from labs, so you need to evaluate with photos or video
- −Color tends to show more at the pointed ends than in rounds
- −A poorly cut oval can look dull or overly glittery instead of brilliant
How big is a oval diamond? (MM to carat)
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.
How to buy a oval diamond
- •Always request video or high-quality images to evaluate bow-tie severity. Lab reports won't tell you.
- •Stick to L/W ratios between 1.35-1.50 for the most balanced, classic oval shape
- •Color is more visible in ovals than rounds. Consider staying H color or higher, especially in white gold or platinum.
- •Check symmetry carefully: the two halves should mirror each other and the ends should match in width
- •VS2 or SI1 clarity is usually eye-clean in ovals, but verify inclusions aren't concentrated at the narrow ends
- •Consider a six-prong setting with prongs at the tips to protect the pointed ends from chipping
What makes a oval diamond unique?
How much does a oval diamond cost?
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 →How does the oval compare?
Technical Specifications
- Facets
- 58
- Brilliance
- very high
- L:W Ratio
- 1.30:1 to 1.50:1 (classic oval), with 1.35-1.45:1 most popular
Last updated: 2026-07-16
At a Glance
- Price vs Round
- 15-25% less than round brilliant
- Popularity
- Second most popular shape, rapidly growing (approximately 20% of engagement ring sales)
- Sparkle
- very high
Best For
Setting Ideas
- Solitaire with a thin band. Maximizes the elongated look.
- Halo. Enhances the already-large face-up size for maximum impact.
- Three-stone with pear or trillion side stones
- East-west setting (a contemporary twist that sets the oval horizontally)
- Cathedral. Adds height and showcases the stone's profile.
- Hidden halo. Extra sparkle visible from the side without competing with the center stone.