Lab-Grown Diamond Engagement Ring

Imagine the delicate silhouette of a marquise diamond, its tapered points echoing the graceful arc of a Brooklyn skyline at dusk. This semi-set halo engagement ring foundation in platinum invites you to choose a 9 x 4.5 mm marquise center stone, ready to be embraced by a finely crafted halo that amplifies its slender drama.

Hand-forged in our Williamsburg studio, the platinum band is polished to a satiny finish that feels cool and substantial against the skin. The halo setting is designed with precision to sit low, ensuring daily comfort and ease beneath gloves or alongside stackable bands. Each prong is meticulously shaped to secure the stone while allowing light to flood the facets, enhancing the marquise’s signature elongated brilliance.

Our commitment to ethical jewelry is reflected in the exclusive use of lab-grown diamonds, offering clarity and sparkle with a lighter environmental footprint.

This ring suits those who appreciate architectural elegance with a modern edge—its slim profile complements slender fingers and pairs beautifully with minimalist or vintage-inspired styles. The semi-set format allows you to select a center stone that resonates personally, making the design uniquely yours.

Should you need resizing or prefer a custom finish, our Brooklyn studio offers personalized consultations to ensure a flawless fit and finish.

Visit us in Williamsburg or begin your custom design journey online to bring this marquise halo vision to life with Haejin Jewelry’s expert craftsmanship and ethical approach to fine jewelry.

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.

Finished for daily wear — a low-profile silhouette and polished edges help minimize snagging.