Estimated Diamond Size Comparison
Compare two diamonds by carat weight and shape to see their estimated face-up dimensions, visible area, and relative size.
First Diamond
Second Diamond
Diamond A vs. Diamond B
Compare the estimated face-up size of both diamonds below.
Visual Size Comparison
The shapes below are scaled proportionally for comparison. They are not intended to represent an exact physical-size image.
1.00 ct Round
1.00 ct Round
Both diamonds have approximately the same estimated face-up area.
Quick Comparison
How the Diamond Size Comparison Works
Enter a diamond shape and carat weight to see an estimated face-up size. The calculator uses typical proportions for each diamond shape to estimate its approximate length and width.
Because diamonds are natural or individually cut stones, actual measurements can vary even when two diamonds have the same carat weight and shape. Use the results as a visual comparison rather than an exact measurement of a specific diamond.
Understanding Diamond Size
Carat weight and visible size are not the same thing. Carat measures a diamond’s weight, while its visible size depends largely on its length, width, depth, and shape.
This is why two diamonds with the same carat weight can appear different in size. Elongated shapes such as oval, pear, marquise, and emerald can have different face-up proportions from round diamonds of the same weight.
Why Diamond Shape Matters
Diamond shape affects how a diamond’s carat weight is distributed. Some shapes tend to have a larger-looking face-up appearance, while others may carry more of their weight in depth.
The comparison tool accounts for typical proportions associated with each selected shape to provide an estimated visual comparison.
Important Accuracy Note
Important: The dimensions shown by this calculator are estimates based on typical diamond proportions. They are not the exact measurements of an individual diamond. Actual length, width, depth, and face-up appearance can vary depending on the diamond’s cut and proportions.
Before You Buy
If you are comparing actual diamonds, check the diamond’s listed measurements, such as length × width × depth, rather than relying only on carat weight. A grading report or jeweler’s specifications can provide the measurements for a specific stone.