Ada Diamonds specializes in large, sensational lab diamonds of the highest quality. Every ring is custom and made to order by award-winning artists in the USA. Our round lab diamonds are hand-selected for clean arrows, scintillation, and brilliance.

1.5 Carat Three Stone Engagement Ring

14k rose gold three stone engagement ring, featuring a 1.5 carat round brilliant lab diamond center stone and pear side stones. See additional design details for the Round and Pear Setting.

2 Carat Three Stone Engagement Ring

Platinum three stone engagement ring, featuring a 2 carat round brilliant lab diamond center stone and triangular brilliant side stones. See additional design details for the Round and Trillion Setting.

2.5 Carat Halo Engagement Ring

Platinum halo engagement ring, featuring a 2.5 carat round brilliant lab diamond. See additional design details for the Round Halo Pave Setting.

3 Carat Solitaire Engagement Ring

Platinum solitaire engagement ring, featuring a 3 carat round brilliant lab grown diamond. See additional design details for the Round Classic Six Prong Solitaire.

3.5 Carat Three Stone Engagement Ring

Platinum custom three stone halo engagement ring, featuring a 3.5 carat round brilliant lab grown diamond. See additional details for a Custom Three Stone setting.

4 Carat Diamond Band Engagement Ring

Platinum diamond band engagement ring featuring a 4 carat round lab grown diamond center stone. See additional details for the Round Cathedral Pave Setting.

5 Carat Solitaire Engagement Ring

Platinum solitaire engagement ring featuring a 5 carat round brilliant lab grown diamond. See additional details for the Round Classic Four Prong Solitaire.

6 Carat Diamond Band Engagement Ring

Platinum diamond band engagement ring, featuring a 6 carat round brilliant lab diamond. See additional design details for the Round Petite Pave Setting.

Ready to create your own custom round lab diamond engagement ring?

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New to Lab Diamonds?

Explore frequently asked questions, see lab diamond pricing, and more.

Shop Fine Jewelry

Shop fine jewelry for occasions big and small featuring curated, conflict-free lab diamonds.