Round cut engagement rings offer a classic, graceful look with an unparalleled sparkle.

Always in high demand, round brilliant diamonds are a true classic with an elegant look and feel. 

Beloved by celebrities like Lauren Conrad and Keira Knightly, round brilliant diamonds lend themselves well to a wide variety of styles and settings from statement solitaires, to diamond pave bands, or stunning halo settings. 

Your Ada Concierge will help you design the perfect setting for an extraordinary engagement ring you'll love forever. 

Find your style


Show off your style with a classic solitaire and East West prongs, or get inspired by our solitaire styles.

Wedding Bands

Got the ring? Find the perfect band to complement your engagement ring style.

Fancy Colored

Commit to forever with a fancy colored lab created diamonds set to your specifications.

 Manmade Round Brilliant Diamonds
 Open Trellis Lab Diamond Solitaire

A cut above the rest

Perfected in 1919 by Marcel Tolkowsky, the round brilliant cut in unmatched in timeless style and sparkle. The popularity of round diamonds belies the difficulty and complexity of this beautiful cut which is designed with 58 facets (57 if the culet is excluded). Even with modern technology, cutting a round shape from a rough diamond crystal nearly always results in a loss of weight around 50%-meaning the rough crystal from which a round brilliant is cut must be larger than other shapes.

Brilliant cuts with perfect symmetry between their table (top) and pavilion (bottom) are known as "ideal cuts". While often misused as a marketing term applied to other shapes, ideal cuts only apply to round brilliant diamonds. 

Round diamonds with excellent cuts are well known for a phenomenon referred to as "hearts and arrows", referring to a visual phenomenon that occurs in ideal cut diamonds with excellent symmetry. 

Ada's Concierge team will carefully hand select and visually inspect each  round brilliant diamond they share with you to ensure it meets our rigorous quality standards. They'll share with you a curated list of the best lab grown diamonds available along with HD videos, images and grading reports to ensure you'll be delighted with the sparkle and fire of your lab created diamond. 


Celebrate forever with a brilliant commissioned diamond grown from your meaningful mementos

Ada Diamonds cultures diamonds from donor carbon, provided by you. We can process and purify any carbon-containing items — flowers from your wedding, graduation keepsakes, excess materials from a house remodel — into pure diamond, making for the ultimate in meaningful, custom jewelry. We would love to celebrate your finest moments and memories with a commissioned diamond.