If you compare diamonds of identical carat weight, color and clarity, you will notice that some shapes cost significantly more than others. Understanding which cut commands the highest price — and why — helps you decide whether to pay a premium for it or redirect that money toward a larger or higher-quality stone.
The round brilliant is the most expensive diamond cut per carat, often 20–40% more than fancy shapes of the same grade. Two things drive this: about 60% of the rough crystal is polished away to achieve its ideal proportions, and round brilliants are in the highest demand. Fancy shapes such as emerald, Asscher, oval and cushion retain more rough and cost less, making them strong value alternatives.
Why the round brilliant costs the most
The round brilliant is engineered for maximum sparkle, and reaching its ideal proportions means cutting away roughly 60% of the original rough diamond. That lost weight is effectively paid for by the buyer. On top of that, the round is by far the most requested shape for engagement rings, and high demand keeps prices firm. You can see how cut quality is graded in our diamond education section.
How other shapes compare
Fancy shapes — anything that isn't a round — generally cost less per carat because they preserve more of the rough crystal and face softer demand. The savings vary by shape:
- Emerald and Asscher: among the lowest price per carat, as their step cuts retain a lot of rough
- Oval, pear and marquise: moderately priced and look large for their weight
- Cushion and radiant: good value with plenty of sparkle
- Princess: typically the best value among brilliant-style square cuts
Because a fancy shape can look as large as a pricier round while costing less, many buyers choose one to stretch their budget. Compare the savings further with our natural versus lab-grown price comparison.
Does cut grade change the price too?
Yes. Even within round brilliants, an Excellent or Ideal cut grade costs more than Good or Fair, because superior cutting produces more brilliance. Our guide on Excellent versus Very Good cut explains where the sweet spot lies.
Getting the most for your budget
If sparkle is your priority and budget is flexible, the round brilliant justifies its premium. If you want maximum size or savings, an oval, cushion or emerald delivers a beautiful stone for less. Choosing a lab-grown diamond in any shape stretches the budget further still — explore options on our lab-grown diamonds hub.
Frequently asked questions
Which diamond cut is the most expensive?
The round brilliant, because up to 60% of the rough is cut away to achieve its proportions and demand for it is the highest.
Which cut is the cheapest?
Step cuts such as emerald and Asscher tend to have the lowest price per carat, as they preserve more of the rough crystal.
Is a round diamond worth the premium?
If unmatched brilliance matters most to you, yes. If size or value is the priority, a fancy shape offers more diamond for the money.
