What are the most popular gemstone cuts for custom engagement rings?
The short answer is that round brilliant is still the sales leader by a wide margin, and it will probably stay that way. But the more interesting answer -...
The short answer is that round brilliant is still the sales leader by a wide margin, and it will probably stay that way. But the more interesting answer - the one I give across the bench - is that the most popular cut right now isn't round at all. It's oval, and it has been for about three years running.
I'm going to walk through the cuts I actually see clients asking for, in rough order of frequency. This isn't a ranking of what's best. It's what lands on my bench.
Round brilliant
About 40% of the engagement rings I make start with a round brilliant. It's the default for a reason: it has the best light return of any cut, it's the most forgiving of setting styles, and it's the easiest to sell secondhand if that ever matters. A 1.04 carat round, GIA graded, triple excellent - that's a known quantity. You can price it, insure it, and reset it without surprises.
What I tell clients who come in wanting a round: if you want the most sparkle and the least risk, this is your cut. If you want something that looks like you instead of something that looks like everyone else's ring, keep reading.
Oval
Oval has been the breakout cut for maybe five years now. It dominated Pinterest and Instagram, and it shows in the consultations. For a while there I was getting four oval requests for every one pear or cushion. It's slowed a little, but it's still the second most requested cut in my shop.
The reason is flattering. An oval elongates the finger, and the shape takes up more visual real estate per carat than a round - a 1.2 carat oval looks closer to a 1.5 carat round on the hand. The catch: ovals have a bowtie effect, a dark cross-shaped zone across the middle. Every oval has one. The question is how prominent it is. I've sent back rough from cutters who let the bowtie go too dark. A good oval has a subtle bowtie, not a black belt across the stone.
Emerald cut
Emerald cut is having a quiet resurgence. It's not as flashy as round or oval - step cuts don't throw the same fire - but the people who want emerald cuts really want them. They're drawn to the hall-of-mirrors effect, the clean lines, the way the cut shows off clarity. An emerald cut with VS1 or better is a beautiful thing. An emerald cut with SI1 inclusions? You'll see them. This cut rewards paying for clarity.
I had a client last spring, Nicole, who came in wanting an emerald cut because she liked the Art Deco look. We ended up with a 1.8 carat, F color, VVS2, in a simple four-prong platinum setting. She wanted it to look like a museum piece, and it does.
Cushion cut
Cushion is a messy category, and that's part of its appeal. You have old mine cushions - hand-cut, off-square, cut for candlelight - and you have modern cushions, which are more uniform and optimized for brightness. Within modern cushions you have cushion-brilliant (more facets, more fire) and cushion-modified-brilliant (a different facet pattern that looks softer). They don't look the same. A client who says "cushion" might mean either, and the first thing I do is show them photos side by side.
Old mine cushions are my personal favorite, and I'm not subtle about it. They were cut by eye, by hand, by people who understood that a diamond in 1900 was going to live in candlelight, not in a jewelry store's LED spots. They have a warmth and a character that modern cuts sand away. If a client brings in an heirloom stone and it's an old mine, I'll usually talk them into a period-appropriate setting rather than recutting it.
Pear shape
Pear has always had a following, but it's more polarizing than oval. People either love the teardrop or they don't. The technical challenge with pears is the same as with marquise: the point is vulnerable. A well-set pear has a V-tip at the point and a bezel or reinforced prong at the rounded end. I've seen too many pears with chipped points from thin prongs. If you want a pear, you want a setting that protects the tip.
Radiant cut
Radiant is the hybrid - step-cut corners with brilliant-cut facets on the crown and pavilion. It gives you the silhouette of an emerald cut with more sparkle. It's popular with clients who want something rectangular but don't want to give up fire. I set a radiant for a client named Marco last year, a 2.3 carat, G/H color, VS2, in a hidden-halo setting. He wanted "modern but not trendy," and radiant delivered that.
A note on antique cuts
Old European cut and old mine cut are not "popular" in the mass-market sense. They're a niche, and it's a small one. But the clients who ask for them tend to be the most informed clients in my shop. They've done the reading. They know that an old European cut was made before motorized bruting machines, so the girdle is thicker, the culet is often open, and the stone has a softer, warmer look than a modern round. They're not looking for maximum sparkle. They're looking for something that glows instead of flashes.
If you're in that camp, the best advice I can give is to buy the stone first and build the ring around it, not the other way around. Antique cuts vary more stone to stone than modern rounds, and the right setting depends on the specific proportions of the diamond you end up with.
What I'd actually recommend
If you walked into my studio today and asked what cut I'd pick for my own engagement ring, I'd say old European cut, about 1.2 carats, F/VS2, in a 2.4mm half-round 18k yellow gold solitaire. It's not the most popular cut. It's not the most brilliant. It's the one I keep coming back to after twenty-two years because it has something to say that a round brilliant doesn't.
But that's me. The most popular cut for you is the one you're still thinking about three weeks later. If you're undecided, go look at stones in person - not online, not in a catalog, but under a jeweler's loupe and in different lights. The cut that catches your eye in real life is the one that wins.