Diamond Education
Diamond Education
Diamonds Prices   |   Diamond Education   |   Diamond History  
Clarity | Color | Cut | Carat | Certification | Imitations | Care | Cost | Moh's Scale of Hardness


The weight of a diamond provides further information for the valuation of a diamond besides cut, clarity, and color. The weight is measured in carats (ct). One carat is equal to 200mg or 1/5 gram. Very small diamonds are measured in points. One point equals 0.01 carats. For example, 0.25 ct is 25 points. The price is directly affected by the weight of the diamond. As seen in the chart left, the price increases as the weight grows larger.

When trying to estimate the weight of a diamond, if you can measure the diameter of the diamond (assuming it is a round cut diamond), you can use the table below to figure out the approximate weight.

Diameters and Their Weights
Weight in Carats
Diameters in Millimeters
Diameter in Inches
0.01 ct
1.3 mm
0.03 ct
2.0 mm
0.05 ct
2.4 mm
0.10 ct
3.0 mm
0.15 ct
3.4 mm
0.20 ct
3.8 mm
0.25 ct
4.1 mm
0.33 ct
4.4 mm
0.50 ct
5.1 mm
0.75 ct
5.9 mm
1.00 ct
6.5 mm
1.50 ct
7.4 mm
2.00 ct
8.2 mm

NOTE: These images are not an exact representation of the corresponding carat sizes

Engagement Ring Diamonds Shop By Type
View All
View All
Learning Center The images and symbols abound with just the mention of this mineral, a natural crystalline substance that exemplifies wealth, prosperity, status, and everlasting love. Even lightning, magic, healing, protection and poisoning have been associated with this gem..............