Oval Diamond mm to Carat Weight Calculator

Oval Diamond Carat Weight Calculator

Length (mm): Width (mm): Depth (mm): Calculate Carat Weight

Here’s a comprehensive table showing the relationship between oval diamond sizes in millimeters (mm) and their corresponding carat weights:

Oval Diamond Size to Carat Weight Conversion Table

Oval MM Size	Oval Carat Weight
5×3 mm	0.25 ct
6×4 mm	0.50 ct
7×5 mm	0.75 ct
7.7×5.7 mm	1.00 ct
8×6 mm	1.25 ct
8.5×6.5 mm	1.50 ct
9×6.5 mm	1.75 ct
9×7 mm	2.00 ct
10×8 mm	2.50 ct
12×8 mm	3.00 ct
12×8.5 mm	3.50 ct
12.5×8.5 mm	4.00 ct
12.75×8.5 mm	4.50 ct
12×10 mm	5.00 ct
14×10 mm	5.81 ct
13×11 mm	6.05 ct
14×12 mm	8.21 ct
15×12 mm	8.76 ct
16×12 mm	9.32 ct
16×14 mm	11.88 ct
18×13 mm	12.86 ct
20×15 mm	14.96 ct

This table provides a comprehensive guide for estimating the carat weight of oval diamonds based on their dimensions. However, it’s important to note that these are approximate values, as the actual weight can vary slightly depending on the specific cut and proportions of each diamond14.

Key Points to Remember:

1. The carat weight increases exponentially with size. For example, doubling the dimensions more than quadruples the carat weight.
2. Oval diamonds tend to appear larger than round diamonds of the same carat weight due to their elongated shape.
3. The ideal length-to-width ratio for oval diamonds is typically between 1.3 and 1.5, but this can vary based on personal preference3.
4. When selecting an oval diamond, consider not just the carat weight, but also the cut quality, color, and clarity to ensure you’re getting the best value and appearance.
5. For a more precise estimate of an oval diamond’s carat weight, you can use this formula:
   Length × Width × Depth × 0.0062 = Approximate carat weight5

Remember, while this table provides a good reference, it’s always best to consult with a professional jeweler for the most accurate assessment of a specific diamond’s characteristics and value.