Discover the relationship between the size and the weight of diamonds. A conversion chart between carats (ct), points and millimeters (mm).
Every diamond has unique characteristics that reveal its beauty, its brilliance and its personality.
The carat represents the weight of the diamond, not its visual size. One carat equals 100 points, while millimeters indicate the physical dimensions of the stone.
Equivalence Chart
Round diamonds — Brilliant cut
(high-quality reference proportions)
| Carats (ct) | Points | Diameter (mm) |
|---|---|---|
| 0.02 ct | 2 pts | 1.7 mm |
| 0.03 ct | 3 pts | 2.0 mm |
| 0.04 ct | 4 pts | 2.2 mm |
| 0.05 ct | 5 pts | 2.4 mm |
| 0.06 ct | 6 pts | 2.5 mm |
| 0.07 ct | 7 pts | 2.7 mm |
| 0.08 ct | 8 pts | 2.8 mm |
| 0.09 ct | 9 pts | 2.9 mm |
| 0.10 ct | 10 pts | 3.0 mm |
| 0.12 ct | 12 pts | 3.2 mm |
| 0.15 ct | 15 pts | 3.4 mm |
| 0.18 ct | 18 pts | 3.7 mm |
| 0.20 ct | 20 pts | 3.8 mm |
| 0.25 ct | 25 pts | 4.1 mm |
| 0.30 ct | 30 pts | 4.3 mm |
| 0.35 ct | 35 pts | 4.5 mm |
| 0.40 ct | 40 pts | 4.8 mm |
| 0.45 ct | 45 pts | 4.9 mm |
| 0.50 ct | 50 pts | 5.2 mm |
| 0.60 ct | 60 pts | 5.4 mm |
| 0.70 ct | 70 pts | 5.7 mm |
| 0.75 ct | 75 pts | 5.8 mm |
| 0.80 ct | 80 pts | 6.0 mm |
| 0.90 ct | 90 pts | 6.2 mm |
| 1.00 ct | 100 pts | 6.5 mm |
| 1.10 ct | 110 pts | 6.7 mm |
| 1.25 ct | 125 pts | 6.9 mm |
| 1.50 ct | 150 pts | 7.4 mm |
| 1.75 ct | 175 pts | 7.8 mm |
| 2.00 ct | 200 pts | 8.2 mm |
Diamond Comparison
The importance of an exceptional cut
The true beauty of a diamond does not depend on its weight alone. An excellent cut balances its proportions, allowing light to interact with its facets and reveal its full potential for brilliance, color dispersion and scintillation.
Natural and sustainable diamonds, with no limits to your choice
Our equivalence chart presents round brilliant-cut diamonds, from 0.02 carat (2 points) up to 2.00 carats, offering a practical reference for understanding their approximate dimensions.
This range represents only the sizes illustrated in our guide, not the limits of our collection or our sourcing capability.
At Ricca Jewelry, we work with diamonds of any carat weight, from the smallest stones used in delicate settings to large diamonds for extraordinary creations.
We offer natural diamonds and sustainable diamonds, grown in a laboratory (lab-grown), in different shapes, cuts, colors, clarity grades and quality classifications, according to each client’s preferences and needs.
Find the perfect proportion for your jewel
At Ricca Jewelry, we believe that choosing a diamond goes beyond its size. It is about finding the ideal balance between beauty, quality and personal style.
Whether for a solitaire ring, a wedding band, a pair of earrings, a rivière or an exclusive creation, our team is ready to guide you in choosing the ideal diamond, considering its characteristics, proportions and your expectations.
Ricca Jewelry — Tradition, excellence and beauty in every detail.
Technical note: the dimensions shown are approximate and may vary according to the individual proportions of each diamond. The chart considers round brilliant-cut diamonds with high-quality reference proportions. Diamonds of other cuts may show different dimensions for the same carat weight.
