Diamond Size Chart
Explore accurate carat weights and millimetre dimensions across all 10 classic diamond shapes. Calibrated for IGI-certified lab-grown diamonds.
Round Brilliant
The most brilliant cut — 58 facets optimized for maximum fire and scintillation. Round brilliant diamonds are measured by diameter.
| Carat Weight | MM Size | Dimensions | Notes & Best Use |
|---|---|---|---|
| 0.25 ct | 4.1 mm | 4.1mm diameter | Stud earrings & delicate pendants |
| 0.33 ct | 4.4 mm | 4.4mm diameter | Delicate everyday rings |
| 0.50 ct | 5.1 mm | 5.1mm diameter | Classic stud earrings |
| 0.75 ct | 5.9 mm | 5.9mm diameter | Elegant pendants & accent rings |
| 1.00 ct Popular | 6.5 mm | 6.5mm diameter | Most popular engagement ring size |
| 1.25 ct | 6.9 mm | 6.9mm diameter | Premium solitaire rings |
| 1.50 ct Popular | 7.3 mm | 7.3mm diameter | Luxury engagement rings |
| 1.75 ct | 7.7 mm | 7.7mm diameter | Statement solitaires |
| 2.00 ct Popular | 8.1 mm | 8.1mm diameter | Exceptional finger presence |
| 2.50 ct | 8.8 mm | 8.8mm diameter | Ultra-premium rings |
| 3.00 ct | 9.4 mm | 9.4mm diameter | The new 3-carat standard |
| 4.00 ct | 10.3 mm | 10.3mm diameter | Exceptional rarity |
| 5.00 ct | 11.0 mm | 11.0mm diameter | Ultimate luxury |
Carat vs MM
Carat measures weight (1 carat = 0.2 grams), not visual size. Two diamonds of the same carat weight can appear different depending on cut and shape.
Cut Affects Size
Deep-cut diamonds hide weight at the base. Choosing an Excellent cut maximizes visible surface area for peak presence.
Apparent Size
Elongated shapes like ovals, pears, and marquises cover more surface area on the finger, making them look visually larger per carat.
IGI Certification
Every diamond at Inasha Diamonds carries an official IGI certificate confirming exact carat weight, cut, color, and clarity.
Find Your Perfect Diamond
All Inasha Diamonds pieces are crafted with IGI-certified lab-grown diamonds set in BIS Hallmarked gold or 950 platinum.