Lab-Grown Diamond Engagement Ring

Imagine the subtle drama of a marquise diamond, its elongated silhouette catching light with a graceful taper that visually lengthens the finger. This semi-set platinum mounting awaits your choice of an 8 x 4 mm center stone, designed to showcase the marquise’s signature brilliance while maintaining a low profile for everyday ease.

Crafted in platinum, the band offers a secure, comfort-fit foundation that balances durability with refined weightlessness. The solitaire setting’s streamlined prongs hold the stone close to the hand, minimizing snagging and enhancing wearability beneath gloves or alongside stackable bands.

Each piece reflects our commitment to ethical jewelry, featuring lab-grown diamonds that combine clarity and conscience without compromise. This mounting suits those who appreciate architectural elegance paired with practical design, ideal for hands that favor slender, elongated shapes.

Should you need resizing, our in-studio experts in Williamsburg ensure a precise fit without disrupting the ring’s clean lines. Lead times are tailored to your custom design process, blending craftsmanship with thoughtful pacing.

Explore this semi-set marquise solitaire in our Brooklyn studio or begin your custom design journey online—where technical assurance meets quiet sophistication.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, where expert craftsmanship and ethical sourcing unite in every custom design.

See how your design comes to life with our Ring Design Online, or start a truly custom piece from scratch in our Williamsburg studio.

Explore our Guides & Education and Stories & Lifestyle for diamond education, care tips, and real studio stories.