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 radiant cut lab diamonds are hand-selected for sparkle, brilliance, and impeccable patterning.

Explore custom radiant cut lab diamond engagement rings

1.5 Carat Three Stone Engagement Ring

14k yellow and white gold three stone engagement ring, featuring a 1.5 carat radiant cut lab diamond and trapezoid side stones. See additional design details for this Radiant and Trapezoid Setting.

2 Carat Halo Engagement Ring

Platinum halo engagement ring, featuring a 2 carat radiant cut lab diamond. See additional design details for this Radiant Halo Pave Setting.

2.5 Carat Diamond Band Engagement Ring

Platinum diamond band engagement ring featuring a 2.5 carat radiant cut lab diamond. See additional design details for this Radiant Petite Pave Setting.

3 Carat Diamond Band Engagement Ring

Platinum diamond band engagement ring featuring a 3 carat radiant cut lab diamond. See additional design details for this Radiant Cathedral Pave Setting.

3.5 Carat Solitaire Engagement Ring

Platinum solitaire engagement ring, featuring a 3.5 carat radiant cut lab diamond. See additional design details for this Radiant Cathedral Solitaire.

4 Carat Three Stone Engagement Ring

14k yellow gold three stone engagement ring, featuring a 4 carat radiant cut lab diamond with trapezoid side stones. See additional design details for this Radiant and Trapezoid Setting.

4.5 Carat Diamond Band Engagement Ring

14k yellow gold and platinum diamond band engagement ring, featuring a 4.5 carat radiant cut lab diamond. See additional design details for this Radiant Cathedral Pave Setting.

5 Carat Solitaire Engagement Ring

Platinum solitaire engagement ring, featuring a 5 carat radiant cut lab diamond. See additional design details for this Radiant Petite Four Prong Solitaire.

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Custom engagement rings made with the best lab grown diamonds on earth.

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Curated fine jewelry featuring gorgeous, conflict-free lab diamonds.

The Ada Difference

You deserve the best. The best is Ada Diamonds.