Match the wearer’s existing jewelry scale
If her everyday earrings are small studs and her necklace pendant is delicate, a 0.75-1 ct center will feel proportional. If she wears bold earrings and layered necklaces, 1.5-2 ct will match her aesthetic.
Interactive Size Guide
See a diamond
at actual size.
Drag the slider to compare carat weights from 0.25 to 3 carat. Circles render at physical scale, so on most screens you\u2019ll see the true millimeter diameter.
Classic Solitaire
1.00 ct
6.5 mm diameter · from $1,900 at DIAVLIA
Rendered at CSS mm scale
The most popular size in US engagement rings. Substantial, elegant.
Full Reference
Every standard size at a glance
| Carat | Diameter | Lab-Grown Price (VS1-F) | Natural Price | Character |
|---|---|---|---|---|
| 0.25 ct | 4.1 mm | $450 | $1,485 | Delicate |
| 0.50 ct | 5.2 mm | $800 | $2,640 | Classic Stud |
| 0.75 ct | 5.9 mm | $1,300 | $4,290 | Modest Engagement |
| 1.00 ct | 6.5 mm | $1,900 | $6,270 | Classic Solitaire |
| 1.25 ct | 6.9 mm | $2,500 | $8,250 | Elevated Classic |
| 1.50 ct | 7.4 mm | $3,200 | $10,560 | Statement Engagement |
| 2.00 ct | 8.1 mm | $5,400 | $17,820 | Luxurious |
| 3.00 ct | 9.3 mm | $11,500 | $37,950 | Rare |
Prices reflect April 2026 market at VS1-F clarity, Excellent cut. Actual prices vary by grade combination, shape, and setting.
How to Choose
What size is right for you?
Consider the finger size
Long, slim fingers carry 1.5-2 ct beautifully. Shorter or narrower fingers typically look best at 0.75-1.25 ct. A very large stone on a small finger can look out of proportion. See our ring sizing guide.
Think about lifestyle
Active lifestyles (lots of handwork, sports, gardening) benefit from 1 ct or under with a low-profile setting. Less active and more formal lifestyles suit 1.5+ ct and higher-profile settings.
Match the setting style
Solitaires read their true carat size. Halos make the center read 30-50% larger. Three-stone spreads weight across three diamonds. See our setting guide for how this interacts with center carat.
Match the shape
Round is the reference size. Elongated shapes (oval, pear, marquise) face-up roughly 10-20% larger than the same carat round. Square shapes (Asscher, princess, cushion) face-up roughly 5-10% smaller. See our shape guides for comparisons.
Pick your size. We\u2019ll pick the stone.
Every Diavlia engagement ring is IGI-certified, crafted in solid 14K or 18K gold or platinum, and automatically enrolled in our Lifetime Upgrade Program, you can trade up to a larger stone anytime.