Round Brilliant Lab Diamond Engagement Rings
The iconic round brilliant adds an elegant feel to any engagement ring style, from statement solitaires to stunning three stone settings.
Your Ada concierge will help you design the perfect setting for an extraordinary engagement ring you'll love forever.
Find Your Style
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Show off your style with a custom engagement ring featuring curated lab diamonds.
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Got the ring? Find the perfect lab diamond wedding band.
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Our bespoke fine jewelry features lab diamonds curated by experts for extraordinary brilliance.
A Cut Above the Rest
Perfected in 1919 by Marcel Tolkowsky, the round brilliant cut is unrivaled in timeless style and sparkle. The popularity of round diamonds belies the complexity of this classic 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.
All of our round brilliant lab diamonds are evaluated in person and hand-selected by our experts for exceptional quality and extraordinary brilliance. Inquire today to find your perfect lab diamond.
Proposal Settings
Not sure what your sweetheart desires? Ada's Proposal Setting program allows you to propose with a beautiful solitaire, then re-design the ring together as a team. The full cost of the solitaire may be applied toward the purchase of a new setting with no re-setting fee.
Graded by the World’s Most Respected Labs
Ada Diamonds is proud to work primarily with GIA for its certified lab diamonds. Learn more about how lab diamonds are graded.