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 cushion lab diamonds are hand-selected for incredible sparkle and patterning. We offer both square and elongated cushions!

Explore custom cushion cut lab diamond engagement rings

1.5 Carat Halo Engagement Ring

14k yellow gold halo engagement ring featuring a 1.5 carat square cushion cut lab grown diamond. See additional design details for this Cushion Single Halo Ring.

2 Carat Three Stone Engagement Ring

Platinum three stone engagement ring featuring a 2 carat square cushion cut lab grown diamond. See additional design details for this Cushion and Tapered Baguette Ring.

2.5 Carat Halo Engagement Ring

Platinum halo engagement ring featuring a 2.5 carat square cushion cut lab grown diamond. See additional design details for this Cushion Halo Pave Ring.

3 Carat Diamond Band Engagement Ring

Platinum diamond band engagement ring, featuring a 3 carat cushion cut lab grown diamond. See additional design details for this Cushion Cathedral Solitaire.

3.5 Carat Solitaire Engagement Ring

14k yellow and white gold solitaire engagement ring featuring a 3.5 carat square cushion cut lab grown diamond. See additional design details for this Cushion Cathedral Solitaire.

4 Carat Solitaire Engagement Ring

14k yellow and white gold solitaire engagement ring featuring a 4 carat elongated cushion cut lab grown diamond. See additional design details for this Cushion Petite Four Prong Solitaire.

Ready to create your own custom emerald cut lab diamond engagement ring?

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Every lab diamond we sell has been hand-selected by our experts for impeccable quality. Build something beautiful today.

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

New to Lab Diamonds?

Explore resources to learn about lab diamonds, discover the Ada Diamonds difference, and more.