Understanding carat weight

Carat weight measures a diamond's size by mass, not by visual dimension: one carat equals 0.2 grams. When a piece has multiple stones, like a tennis bracelet or eternity band, "total carat weight" (TCW or ctw) refers to the combined weight of every stone in the piece, not any single stone.

What does "total carat weight" mean on a multi-stone piece?

On pieces with many stones set in a line, such as a tennis bracelet or eternity band, the total carat weight is the sum of all the stones combined. A 5-carat total weight tennis bracelet might contain dozens of individual smaller stones adding up to 5 carats, not one 5-carat stone.

How does carat weight affect price?

Price does not increase in a straight line with carat weight. Larger individual diamonds are rarer to find and cut than smaller ones, so price per carat rises as size increases, meaning a 2-carat diamond typically costs more than twice a 1-carat diamond of the same quality.

How do I choose the right carat weight?

For everyday pieces like stud earrings, many buyers choose a lower total carat weight for comfortable daily wear, while special-occasion or statement pieces often go larger. The right size depends on personal preference, budget, and how often the piece will be worn.

Frequently asked questions

Is a bigger carat weight always better quality?
No. Carat weight measures size alone. A smaller diamond with excellent cut, color, and clarity can look more brilliant than a larger diamond with lower grades in those categories.

How is carat weight measured?
Carat weight is measured directly on a precision gem scale before a stone is set, and is standard across all diamond types, including lab-grown diamonds.

Does carat weight change how a ring size affects price?
Yes, on eternity-style rings. A larger ring size requires more stones to complete the circle, which increases the total carat weight and therefore the price, even at the "same" design.

Browse jewelry by carat weight in our full collection, or check our Size Guide for ring, bracelet, and necklace sizing.