C/W CARAT WEIGHT

Carat weight refers to the measure of a diamond or gemstone’s mass. One carat equals 0.20 grams and is subdivided into 100 points. For example, a 0.75-carat diamond weighs 75 points.

Carat weight significantly influences a stone’s price, but not always its visual size. Two diamonds of equal carat weight may appear different in size due to differences in cut and proportions. That’s why carat weight should always be considered alongside cut quality, shape, and setting style.

It’s also important to note that carat weight is not the same as size. A well-cut 1.00-carat diamond can appear larger than a poorly cut 1.20-carat stone.

Carat weight plays a major role in determining a diamond’s price, but its influence isn’t always linear. As a diamond’s weight increases, the price per carat also rises—often significantly at key milestone sizes.

Diamonds are priced in brackets or “magic sizes”, and prices tend to jump sharply at certain weight thresholds. For example:

0.50 ct
0.70 ct
0.90 ct
1.00 ct
1.50 ct
2.00 ct
3.00 ct and so on

These milestone weights are in high demand, especially for engagement rings, which drives prices up. A 1.00-carat diamond can cost 30–50% more per carat than a 0.90-carat diamond of the same quality, even though the size difference is visually minimal.

This pricing structure is due to the rarity of larger diamonds and the market’s psychological preference for round numbers. As stones get bigger, they become much rarer, especially with high grades in clarity and color, making them exponentially more expensive.

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