How You Should Actually Shop for a 3 Carat Diamond Ring

We get it. Size matters to you. And because it matters to you, it most definitely matters to us. We hear it time and time again, someone wants a 3 carat diamond ring and the first question is, “how much does a 3 carat diamond cost?” Well, darlings, you’re asking the wrong question. Think about it like buying a house, let’s say. You’re comparing a bunch of properties that are all the same square footage—but everything else is different. Different finishes, different neighborhoods, different layouts…and thus totally different prices. And those are the things that will determine if you’re happy living in that house for, say, ever. Well, you’re going to wear that engagement ring forever too, so here’s how you should actually shop for that stunner.

Are you fancy, now?

This comes as a shock to many diamond newbies, especially since it’s not one of the 4Cs, but the shape of a diamond plays a pretty major role in its price. As the most popular (and available) diamond shape, a round diamond (no matter the size) will cost you about 20% more than any fancy shape. What’s a fancy shape, you ask? That’s the easy question: anything other than round. 

Round

The super standard of the industry, round diamonds with an excellent or ideal cut grade won’t vary much. If you go lower on cut grade (not our recommendation) then you risk getting a diamond that hides its weight in a thicker girdle or deep pavilion, meaning it’ll look smaller from the top view—which is how everyone’s going to see it. An ideal cut 3 carat round diamond should be about 9.3mm in diameter. 

Oval

Like we said, with oval diamonds, you can get a big look for your little buck (ok, maybe little is a reach). But, these shallow-cut diamonds with tons of spread also have all the brilliance of a classic round diamond. What to watch out for? Bow ties. An ideal cut 3 carat oval diamond ring will be about 11.5mm long x 7.5mm wide.

Emerald

It’s not easy to find a really well cut emerald cut diamond, but totally worth it if you do because this elongated, super sophisticated shape will give you plenty of rock to admire. Just be sure not to skimp on clarity grade because the emerald’s long, open facets are like big windows for inclusions to show through. An ideal cut 3 carat emerald will be about 9.5mm long x 7mm wide.

Asscher

Similar to emeralds, the step-cut faceting of an Asscher cut means you probably don’t want to sacrifice on clarity. Unlike emerald, though, Asschers tend to run deep and small like princess cuts. They might look a little under-size for their weight. The trade off? Mesmerizing facets that with a pinwheel pattern that you can get lost in for daaaaays. An ideal cut 3 carat Asscher diamond will be about 8.1mm in length x 8.1mm in width.

Radiant

These mixed-cut diamonds are gorgeous. But they’re not big. Or at least they don’t look it. Typically cut deeper, with smaller face-up measurements, you can find some more elongated shapes that will help you maximize the size appearance. Just make sure they’re not hiding weight in a thick girdle (so you’re not paying for what you can’t see). A 3 carat ideal cut radiant diamond will be about 8.5mm in length x 7.5mm width.

Cushion

It’s harder to determine what you’re getting with a cushion cut diamond because each one is totally unique. Elongated cushions can give you tons of spread and a crushed-ice look that is totally on-trend right now. While squared cushions tend to be cut a bit deeper and therefore have a smaller overall look for their weight. Aim for a depth percentage under 70%, and a table under 70% for best results. An ideal cut 3 carat cushion diamond will be about 9mm long x 8mm wide.

Pear

Because they’re kind of a cross between a round and a marquise diamond, a pear cut diamond will be somewhere in the middle. Deeper under the rounded end and shallower under the point, an ideal cut 3 carat pear shaped diamond will measure about 12.5mm long x 8mm wide, giving you the best of both worlds.

Top of the Class

You guessed it. We can’t have a discussion about diamond pricing without all the Cs showing up. So what’s next? Cut. Truly always the most important of the Cs, cut grade is what determines your diamond’s sparkle. I mean, you could get a 3 carat diamond ring with a low cut grade but…it’s going to look like a big, dull hunk of rock. Kind of missing the point, right? While only round diamonds have actual cut grades, the proportions of fancy shapes can tell you a lot. Our two cents, though? Get your eyes on it! The best way to know if your diamond has the shape and sparkle you’re after? Seeing it. BTW: we can help with that.

Thank You, Next

Don’t think we’re letting you go without a little word on the importance of color and clarity—especially when it comes to purchasing a sizable diamond. Because, yes, the bigger the diamond, the more color it can hold. But going a bit lower in color (say…champagne hued) can get you a warm, sparkling glass of…oh sorry got distracted. But really, a lot of brilliance for less. But also bigger facets also mean bigger windows to see inclusions through. We always recommend starting with something in the middle of the road, say VS1 – VS2, then toggling around until you reach your target price. Again, getting a photo or video of your actual diamond will help you determine how it looks. 

Your Type or Mine?

Lab grown or Earth mined, the rocks don’t lose their…ok that doesn’t rhyme at all. But really, diamond type is a major price differentiator. In general, lab grown diamonds will cost 40-50% less than a comparable mined diamond. We also love moissanite as a diamond alternative for its superb sparkle, durability, and low price tag. Or go all out and shop colored diamonds or gemstones to really open up your options!

Speaking of Possibilities…

When it comes to the best engagement ring settings for a 3 carat diamond, we suggest keeping it minimal. You want the diamond to be the center of attention after all, right? Nothing pops more than a 3 carat stone on a barely-there, 1.5mm band. Also, keep it vertical if you’re going for a fancy, elongated shape. While east-west settings are trending, they’re better suited to 1 or 2 carat diamonds. A 3 carat diamond ring needs that added finger length to really shine.

Want some extra sparkle? If you’re considering an emerald or Asscher, vertical baguette or trapezoid side stones can enhance the hall of mirrors effect. Or try a hidden halo that shines from the side without distracting or adding too much fuss from the top view. Have something specific in mind? Take the ring quiz to get a free sketch!