Round Brilliant

The most commonly chosen shape, this cut has set the standard for all other diamond shapes, and accounts for more than 75% of diamonds sold today. Renowned for its unrivaled fire and brilliance, this cut boasts excellent light refraction properties, causing it to appear brighter than other shapes. When clarity and color are equal, a round diamond will be more valuable than alternative shapes.
Marquise

Timeless and elegant, this cut’s flattering effect creates the illusion of long, slender fingers. Reputed to have been specially made for King Louis XIV of France, who wanted a diamond that simulated the smile of Marquise de Pompadour, this elongated stone has gracefully pointed ends for a dramatic appeal. Due to their extended length, marquise diamonds have more size per carat weight than other shapes and boast a brilliant 58 facets.
Heart

Living up to its name, the heart-cut diamond has become synonymous with love and affection, making it an excellent choice for an anniversary or engagement ring. This ultimate symbol of romance is essentially a pear-shaped diamond with a cleft at the top. The skill of the cutter determines the beauty of the cut. Look for a stone with an even shape and a well-defined outline.
Princess Cut

This is a square or rectangular cut with numerous sparkling facets and often finds its way into solitaire engagement rings. Flattering to a hand with long fingers, it is often embellished with triangular stones at its sides. Because of its design, this cut requires more weight to be directed toward the diamond’s depth in order to maximize brilliance. Depth percentages of 70% to 78% are not uncommon.
Trilliant

This is a spectacular wedge of brittle fire. First developed in Amsterdam, the exact design can vary depending on a particular diamond’s natural characteristics and the cutter’s personal preferences. It may be a traditional triangular shape with pointed corners or a more rounded triangular shape with 25 facets on the crown, 19 facets on the pavilion, and a polished girdle. It is definitely for the adventurous.
Cushion Cut

Cut into a square or rectangular shape with rounded corners and sides, it’s considered by many to be a softer version of the emerald cut. Possessing a character-rich antique look, the cushion-cut diamond is a favorite of those who prefer vintage-style rings and jewelry. This style of cut looks like a cross between an Old Mine Cut (a deep cut with large facets that was common in the late 19th and the early 20th centuries) and a modern oval cut.