Diamond carat weight
Carat measures a diamond’s weight, not its visible size. One metric carat equals 0.2 grams and is divided into 100 points.
The same weight can look different
Two 1.00 ct diamonds may have different diameters and look different on the hand. Shape, depth and proportions determine how the weight is distributed. An elongated oval or marquise, for example, may cover more surface area from above than a deeper stone of the same weight.
Centre stone and total carat weight
The carat weight of a centre diamond is not the same as the combined weight of every stone in a ring. A halo, side stones and pavé may be stated as total carat weight. Check whether a figure refers to the centre stone, side stones or the complete piece.
Carat and 18K mean different things
A diamond’s carat is a measure of weight. The 18K designation describes the purity of gold. The two figures are not comparable.
How to compare carat weight thoughtfully
- Compare measurements in millimetres, not weight alone.
- Consider how the shape meets the ring’s setting and band.
- Weigh cut, colour and clarity before choosing a higher weight.
- Check whether the product-page price covers the setting, the diamond or both.
Choose the proportion that feels right on the hand. A higher carat weight is heavier, but it is not automatically better cut or more appealing.
Read about cut and shape, or compare available diamonds.