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Summary in a few lines:
- Emerald and Asscher are the 2 cheapest shapes per carat out of the 10 common shapes, and they have held that spot in every price check we have run over 12 years.
- Round brilliant is the most expensive of all 10 shapes per carat, and the gap is not subtle.
- The percentage discount stays roughly steady from 1ct to 2ct, but the dollar saving multiplies, because price per carat itself climbs with weight.
- Cheapest per carat is NOT the same as biggest per dollar. Marquise and pear look larger face-up than their weight suggests.
- We give you a 4-filter search recipe so you can price the shape discount yourself, today, in about 5 minutes.
Table of Contents / Toggle
Which Diamond Shape Is Cheapest Per Carat?
Emerald and Asscher. These two step cuts sit at the bottom of the price-per-carat ladder among the ten shapes people actually shop, with marquise and princess just above them. Round brilliant sits at the top, alone. Hold color, clarity and carat steady, swap round for emerald, and the price drops hard.
That is the whole answer, and you can audit it in five minutes without taking our word for it. Set one weight, one color grade and one clarity grade, then change nothing but the shape and watch the lowest price move.
Feel free to run that experiment yourself on the loose diamond search at Blue Nile, where shape is a single row of buttons and the price column re-sorts instantly.
Fact: GIA issues an overall cut grade for round brilliants only. Every fancy shape gets polish and symmetry grades instead, which is part of why fancy shapes are priced with more room to negotiate.
Why Do Fancy Shapes Cost Less Than Round?
Three reasons, and only one of them has anything to do with beauty. Round brilliants waste far more of the rough crystal, they carry the heaviest demand of any shape by a wide margin, and they are the only shape with a standardised cut grade that lets sellers charge for it. Fancy shapes escape all three.
1. Rough Yield
A round brilliant typically loses more than half the weight of the rough stone it was cut from. Step cuts like emerald and Asscher follow the natural shape of the crystal far more closely and keep much more of it. Less waste, lower cost per finished carat.
2. Demand
Round is the default. It is what most buyers picture when they picture a diamond, and cutters price to that demand because they know the stone will sell. A marquise or an Asscher has to wait for the buyer who specifically wants a marquise or an Asscher.
3. Cut Grading
A round can be sold as Excellent or Ideal on a certificate, and that letter carries a premium. Fancy shapes have no equivalent, so the seller has fewer levers to justify a higher ask. If you want the mechanics of that grade, our guide to table and depth percentages for round and all shapes covers what the numbers should look like on each outline.
Let’s put the shapes in order, cheapest first.
The Ranking at 1 Carat, Cheapest to Most Expensive
At one carat, the order runs emerald, Asscher, marquise, princess, cushion, pear, radiant, heart, oval, round. Positions one, two, nine and ten are stable year after year. Positions three through eight trade places depending on what is in stock that week, so treat the middle of this list as a neighbourhood rather than a fixed rank.
1. Emerald
The cheapest per carat, consistently. Long parallel facets, high rough yield, and a buyer pool that is loyal but small. The catch is clarity: that open table acts like a window, so inclusions and tint show more readily than they would in a brilliant-faceted stone.
2. Asscher
Same step-cut economics as emerald in a square outline with cropped corners. Demand is thinner still, which keeps the asking price down. It reads vintage rather than sparkly, and it rewards a slightly higher clarity grade for the same reason emerald does.
3. Marquise
Elongated, pointed at both ends, and cut from flatter rough with very little waste. Marquise also spreads wider face-up than its weight implies, which makes it the quiet value pick on this list. Watch the symmetry across the two points.
4. Princess
The square brilliant that comes out of octahedral rough with almost no waste: two princesses from one crystal, in the classic case. Fashion moved on from it, and the price reflects that. We compare it head to head in our princess cut vs. round cut diamonds guide.
5. Cushion
Produced in real volume, so supply is deep at every weight. Cushion holds a decent price because it stayed popular, but deep supply keeps it well under round. Depth percentages run high on this shape, so a heavy cushion can look smaller than its carat weight.
6. Pear
Good yield, moderate demand, and a large face-up footprint per carat. Pear is priced in the middle and looks bigger than the middle. Symmetry matters here: the shoulders should mirror each other, and the point needs protection in the setting.
7. Radiant
A cut-corner rectangle with brilliant faceting, so it sparkles like a round and prices like a fancy. Yield is respectable and demand is steady rather than hot. It handles lower color grades better than a step cut does, which saves money twice.
8. Heart
Hard to cut well, and the difficulty pushes the price above shapes with better yield. Demand is modest, so it never climbs near round. Below about 0.75ct the outline gets hard to read once it is set, which is a shape problem rather than a price problem.
9. Oval
The most in-demand fancy shape of the last few years, and the price shows it. Oval sits closer to round than anything else on this list. It also carries a specific risk, the dark band across the centre that we cover in our guide to the bow tie effect in oval diamonds.
10. Round
The most expensive shape per carat, full stop. You pay for the wasted rough, for the demand, and for the cut grade on the certificate. What you get back is the highest light return of any outline, which we break down in why round diamonds sparkle more.
How Does the Shape Discount Change at 2 Carats?
The percentage gap between round and the step cuts stays broadly similar from 1ct to 2ct. The dollar gap does not. It multiplies, because price per carat climbs steeply with weight. A two carat stone costs far more than two one carat stones of the same grades, so the same percentage saved is worth several times more cash in hand.
That is why shape is the single most powerful lever at two carats and above. At half a carat, switching from round to emerald buys you dinner. At two carats, it can buy you a clarity grade, a color grade and the setting.
Tip: Weight also does not translate evenly into visible size across shapes. Our guide to how big a 1 carat diamond looks on the hand shows the millimetre spreads, and the elongated shapes always measure wider than their weight suggests.
To see the two carat gap in dollars, set the weight range to 2.00–2.10 on the Blue Nile diamond search and toggle round against emerald with everything else locked.
How Do You Price the Shape Discount Yourself?
Lock four filters, change only the shape, and read the cheapest result each time. Weight range, color grade, clarity grade and certificate lab stay fixed. Shape is the only variable you touch. Write down the lowest price for each of the ten shapes and you have a live ranking that is accurate today, not accurate last quarter.
Here is the recipe we use in-house. Weight 1.00–1.09, color H, clarity VS2, GIA certified, and for the round leg of the test, Excellent cut with excellent polish and symmetry.
Then cycle the shape buttons one at a time and sort by price, low to high. Ignore the outliers at the very bottom, since the cheapest stone in any shape is usually cheap for a reason you can see on the video.
James Allen’s 360-degree videos made this kind of side-by-side auditing easy for years before the site closed, and that collection now lives inside Blue Nile, so the inspection habit still works. Load the video, then judge with your eyes before you judge with the certificate.
Remember this: a shape ranking without a fixed color and clarity grade underneath it is meaningless. Half the “emerald cuts are cheap” screenshots floating around are comparing an SI2 J emerald to a VS1 F round.
Cheapest Per Carat vs. Biggest Per Dollar
These are two different questions, and mixing them up costs money. Cheapest per carat means lowest price for a given weight, which the step cuts win. Biggest per dollar means the widest face-up outline your money can buy, and that goes to the elongated brilliants (marquise, pear and oval) because they spread rather than sit deep.
A well-proportioned marquise can look a full grade or two heavier than it weighs across a finger. A deep cushion can look lighter than it weighs. Same carat number on the certificate, very different visual size.
So pick your goal before you pick your shape. Lowest total spend points to emerald or Asscher. Maximum visible size for the same budget points to marquise or pear, and there is a full walkthrough of the trade-offs in our guide to the 10 most popular diamond shapes.
What Doesn’t Matter When You Shop by Shape
Two things buyers agonise over barely register here. A single step in color grade (G to H, H to I) is close to invisible in a brilliant-faceted fancy shape once it is set in yellow or rose gold. Fluorescence at faint or medium is a non-issue too, and it often prices lower.
What does matter is clarity, and only in the step cuts. An emerald or an Asscher shows its interior like a pane of glass, so an inclusion that hides comfortably in a radiant will sit there in plain view.
Our rule after twelve years of looking at these stones for readers: spend the shape saving on clarity if you are buying a step cut, and spend it on carat if you are buying a brilliant one. Never spend it on a grade you cannot see.
Do Lab-Grown Diamonds Follow the Same Shape Ranking?
The order holds. Round still carries the premium, step cuts still price lowest, oval still sits near the top. The absolute dollars are much smaller though, so the shape discount matters less in cash terms than it does with natural stones, where it can run into four figures at two carats.
There is a second wrinkle. Lab rough is grown in shapes that suit some outlines better than others, so the middle of the ranking shuffles more than it does with mined goods.
If you are pricing both routes side by side, our breakdown of how lab-grown diamond pricing works explains why the per-carat curve behaves differently as weight climbs.
Summary: Final Words on the Cheapest Diamond Shapes Per Carat
Buy emerald or Asscher if the lowest price per carat is the goal, and budget a higher clarity grade to go with it. Buy marquise or pear if you want the biggest look for the money. Buy round only if you specifically want round, because you are paying for it.
And do the four-filter test before you commit. The ranking in this article is a tendency, built from years of watching these prices move. The numbers on your screen tonight are the ones that decide your purchase.
Shape is the cheapest upgrade in diamond buying. It costs nothing to change your mind about an outline, and it can change your budget by thousands.
Frequently Asked Questions on Diamond Shape Prices
Which diamond shape is least expensive?
Emerald cut, with Asscher immediately behind it. Both are step cuts with high rough yield and modest demand, which is the combination that produces the lowest price per carat. Marquise and princess follow closely.
How big is the fancy shape discount versus round?
Large enough to change what grades you can afford, and it is best measured live rather than quoted. Fix weight, color, clarity and lab, then toggle only the shape in a loose diamond search and read the two lowest prices. That difference is your discount, in dollars, today.
Why is round the most expensive diamond shape?
Three reasons stack up. A round brilliant discards more than half the rough it is cut from, it carries the highest demand of any shape, and it is the only shape GIA gives an overall cut grade to, which gives sellers a premium to charge for.
What is the best value diamond shape?
It depends which value you mean. For lowest cost per carat, emerald. For the largest face-up size per dollar, marquise or pear, because elongated brilliants spread wider than their weight suggests instead of hiding weight in depth.
Is the shape discount bigger at 1 carat or 2 carats?
The percentage is similar. The dollar saving is much bigger at 2 carats, because price per carat rises steeply with weight, so the same percentage represents far more cash. Shape is the strongest budget lever at two carats and above.
Does a cheaper shape mean a lower quality diamond?
No. Shape pricing reflects cutting yield and demand, not quality. An emerald cut with excellent polish, excellent symmetry and a GIA report is every bit as fine a stone as a round with the same grades.
Which cheap shape needs a higher clarity grade?
The step cuts, emerald and Asscher. Their large open facets show the interior clearly, so an inclusion that disappears in a brilliant-faceted shape stays visible. Spend part of the shape saving on clarity and inspect the video before you buy.
Still not sure where to buy your diamond?
Start with the shape buttons rather than the price slider. You can compare all ten outlines at a fixed set of grades in the loose diamond search, and once you have chosen the stone, browse the engagement ring settings built for each shape to see how the outline actually wears.
You may also want to read:
- The 10 most popular diamond shapes
- Princess cut vs. round cut diamonds
- Best table and depth percentages for round and all shapes
- The bow tie effect in oval diamonds
- Which diamond shape sparkles most
- How lab-grown diamond pricing works
