The princess cut diamond is the sharp, square shape that once sat second only to the round, and in 2026 it is quietly making its case again. Crisp corners, a bold crosshatch of sparkle, and a lower price per carat make the princess cut diamond one of the smartest value buys in fine jewelry. This guide explains what the shape is, how to protect its corners, how it compares to other cuts, and where lab-grown diamonds change the math.

What Is a Princess Cut Diamond?

A princess cut diamond is a square stone with sharp, uncut corners and a brilliant facet pattern that fires off intense, contemporary sparkle. The Gemological Institute of America describes the princess as a "square modified brilliant," a facet style that gives it "electrifying sparkle and scintillation." It is the youngest of the classic shapes, developed in the late 20th century, which is exactly why it reads as modern rather than vintage.

That square brilliance made the princess a phenomenon. According to National Jeweler, it was once the No. 2 diamond shape on the market, and it still ranks just behind the round brilliant among fancy shapes today. At Roomy's, every stone is a lab-grown, IGI-certified diamond set in solid 10, 14, or 18kt gold.

Why the Princess Cut Diamond Is a Value Pick in 2026

The princess cut diamond is the value pick of 2026 because it costs less per carat than a round while delivering almost as much sparkle. As GIA notes, a princess retains far more of the original rough crystal during cutting, so princess cut diamonds cost less per carat than comparable rounds. In a market where lab-grown stones now anchor 61 percent of engagement rings at a $4,600 average, that saving stacks with lab-grown pricing to buy a genuinely large, brilliant square.

The shape also suits the moment. While ovals and vintage cushions lead the fancy-shape conversation, the princess offers something they cannot: clean geometry and modern edge. It is the square that never needed a revival because it was engineered for sparkle from the start.

The princess cut is the round brilliant's square sibling: nearly the same fire, sharper lines, and a friendlier price per carat.

The One Weakness: Protect the Corners

The most important thing to know about a princess cut diamond is that its four sharp corners are its weak point and must be protected in the setting. Those pointed corners are where a princess is most likely to chip against daily wear. The good news is that a smart setting solves it entirely. Run through this checklist before you buy:

• Choose a setting with V-shaped prongs that cover and shield each of the four corners.
• Look for a length-to-width ratio of 1.00 to 1.05 for a true square, or up to 1.10 for a subtle rectangle.
• Favor color G to I, since the princess holds a little warmth in its corners, especially in yellow gold.
• Choose eye-clean VS1 to SI1 clarity and confirm the details on the IGI report.

Princess Cut Diamond vs Other Shapes

The princess cut diamond sits between the round's maximum sparkle and the emerald's calm elegance, offering brilliance in a square outline at a lower price. Because fancy shapes do not receive an overall GIA cut grade, comparing them by look, durability, and price is the practical way to choose. Here is how the princess stacks up against the shapes buyers cross-shop most.

Settings and Pairings for a Princess Cut Diamond

The best settings for a princess cut diamond frame its square outline with clean lines, from a channel-set band to a straight eternity band that echoes its geometry. The princess pairs naturally with modern, architectural design, and it stacks cleanly with straight bands rather than curved ones. If you are still comparing shapes, our round brilliant guide covers the shape it trails, and our emerald cut guide covers the other great square. These lab-grown pieces pair beautifully with a princess.

Crenelle Diamond Architectural Band

from $1,000

Prism Emerald Eternity Band

from $1,050

Linear Diamond Half Eternity Band

from $700

Tendril Diamond Vine Ring

from $400

Prefer a silhouette with movement over clean lines? Our 2026 bypass ring trend guide shows how the wrap-around style is winning over anyone who wants a ring that feels a little different.

Is a Lab-Grown Princess a Good Value?

A lab-grown princess cut diamond is one of the best values in the entire diamond world, stacking two savings at once. The princess already costs less per carat than a round because it wastes less rough, and choosing lab-grown lowers the price again while keeping the stone chemically and optically identical to mined. The result is a big, brilliant, modern square, backed by an IGI report and Roomy's own certification, for far less than you would expect. For a buyer who wants maximum stone and unmistakable sparkle without paying the round premium, the lab-grown princess is hard to beat, and it looks as current today as it did when it first arrived.