A Beginner's Guide to Diamond Shapes for Engagement Rings


Learn all about a diamond’s shape and more with this helpful guide.

Though shape doesn’t contribute to the four C’s of diamond grading, it’s an important factor to know when selling your diamond ring. Cut is often confused with shape, but the two are distinctly different. The cut has to do with how the diamond’s facets are arranged for maximum sparkle, while the shape creates the actual look and style of the diamond itself.

If you’re getting ready to sell your diamond ring, it’s good to educate yourself about your diamond’s shape so you can receive the right offers from the right buyers.

Round Cut

The Round Cut is a Classic Diamond Ring Shape

The round cut is the most popular among diamond cuts for engagement rings, creating a classic yet versatile look that allows wearers to easily customize around it to fit their personal style. Designer Cardinal Mazarin created the first cross-cut diamond in 1650, but the rounded diamond shape that has gained so much popularity in the modern era was developed in the 20th century.

Oval Shaped Rounded Diamonds

The first known oval diamond was cut in the 14th century, though it was popularized in the early 1960s by Lazare Kaplan. This diamond cut is particularly popular for engagement rings because of its narrowed shape that creates an elongated look on the wearer’s finger.

Rounded Square Engagement Rings are Called “Cushion”

Sometimes referred to as the “pillow” or “fancy” cut, the cushion diamond cut style originated in the 19th century and offers the wearer a lot of flexibility. They can come with either sharper edges or a softer look, but the rounded corners and larger facets can create extra brilliance. These rounded square engagement rings are among the most versatile diamond ring cuts.

Pear Cut as a Diamond Ring Shape

Though it’s one of the trendier and more fashionable of all the different cuts of diamond rings, the pear cut actually dates all the way back to the 15th century with a Flemish cutter named Lodewyk van Bercken’s design. Today, many people know about the pear cut diamond because of the 17-carat stone that sits on Victoria Beckham’s finger.

Princess Cut

Princess Cut Diamonds are Beloved for Engagement Rings

The princess diamond ring is uniquely shaped and possesses a great deal of sparkle. The princess cut that we admire today, with its four sides of equal length and fiery brilliance, came to be in the 1960s thanks to a London cutter named Arpad Nagy. Now, it’s modernized regality has made it one of the most popular diamond cuts for engagement rings in the 21st century.

The Emerald Cut is a Popular Rectangle Diamond Engagement Ring

Though it is named for its ability to properly accentuate the deep viridian green of an emerald gem, this style is just as beautiful when used on a diamond. Its elongated shape and step-cut faceting create a “hall of mirrors” illusion that is completely unique.

Having become popular in the 1940s thanks to pop culture icons like Grace Kelly and Elizabeth Taylor, the emerald diamond shaped engagement ring became a favorite of the most outgoing and confident fiancés and spouses.

Marquise Shape for Diamond Rings

In the 1800s, King Louis XV of France (1710-1774) commissioned a jeweler to design a diamond ring shape that resembled the lips of his mistress, Jean Antoinette Poisson, the Marchioness Madame de Pompadour, and so the marquise cut was born. Also referred to as the Navette, which means “little boat” in French, this diamond’s two rounded sides and two sharp corners resemble a skinny canoe that will give an illusion of elongation on the wearer’s finger.

Choosing the style of your engagement ring’s diamond cut is tough because there are so many beautiful options. If you want to upgrade or update your diamond ring, Mondiamo will help you understand your diamond's shape and other attributes, and help you get the highest price when getting ready to sell your old diamond jewelry.