Lab-Grown Diamond Engagement Ring

When light catches the elongated silhouette of a marquise diamond, it casts a striking, tapered brilliance that feels both bold and refined. This semi-set halo engagement ring foundation in platinum offers a sculptural frame designed to amplify the stone’s dramatic 12 x 6 mm presence.

Handcrafted in our Williamsburg studio, the platinum band is meticulously finished to a smooth, comfort fit that rests lightly on the finger. The halo setting, ready to embrace your chosen marquise, is crafted with precision prongs that balance security with an open design, allowing maximum light to dance through every facet.

Each piece reflects our commitment to ethical jewelry, featuring lab-grown diamonds that deliver exceptional clarity and sparkle with a reduced environmental footprint.

Its low-profile halo silhouette suits those who appreciate a statement ring that remains practical for daily wear—ideal for slender fingers or anyone seeking a piece that layers seamlessly with wedding bands or stackable rings.

Should you need resizing or prefer a custom finish, our Brooklyn studio offers personalized consultations to ensure your ring fits perfectly and reflects your vision.

Explore this semi-set halo marquise ring in person at our Williamsburg workshop or begin your custom design journey online, where expert guidance meets artisan craftsmanship.

Haejin Jewelry stands as a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert craftsmanship with ethical sourcing and a distinctly local, artisanal approach.

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.