Lab-Grown Diamond Engagement Ring

When light catches the elongated silhouette of a marquise diamond, it reveals a subtle drama that draws the eye along the finger’s natural line. This semi-set halo engagement ring in platinum frames a 6 x 3.5 mm marquise stone, inviting you to select a center that balances brilliance with architectural grace.

Crafted in our Williamsburg studio, the platinum band is shaped for daily wear—smooth beneath the finger with a low-profile halo that enhances sparkle without height. Each curve and prong is hand-finished to ensure the setting cradles your chosen diamond securely while maintaining an artisan’s precision.

Our commitment to lab-grown diamonds means your ring carries a clarity and ethical provenance that aligns with mindful luxury, reducing environmental impact without compromise.

The slender band suits those who favor a refined silhouette, ideal for stacking or wearing solo. Its modest height fits comfortably under gloves or sleeves, making it a practical choice for everyday life.

Should you need resizing, our in-studio experts handle adjustments with care to preserve the ring’s integrity and finish.

Explore this semi-set halo marquise ring in person at our Williamsburg workshop or begin your custom design journey online—crafted for those who appreciate thoughtful detail and ethical artistry.

Haejin Jewelry is a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, where expert craftsmanship meets sustainable values 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.