Lab-Grown Diamond Engagement Ring

Sunlight catches the elongated points of a marquise diamond, casting a slender, dramatic shadow that seems to stretch beyond the hand. This semi-set platinum mounting awaits your choice of an 8 x 4 mm marquise center, designed to showcase the stone’s tapered drama with a delicate yet secure four-prong setting.

Crafted in our Williamsburg studio, the band’s polished platinum offers a cool, weighty feel that balances durability with refined comfort. Its low-profile silhouette ensures the ring sits close to the finger, making it ideal for everyday wear and effortless stacking alongside wedding bands or delicate bracelets.

Each piece reflects our commitment to ethical jewelry: lab-grown diamonds provide the same brilliance and clarity as mined stones while reducing environmental impact.

The slender shape of the marquise naturally elongates the finger, appealing to those who appreciate a blend of vintage allure and modern geometry. This mounting’s streamlined design suits a variety of hand sizes, especially those seeking a ring that feels both substantial and unobtrusive.

Should you need resizing, our in-house artisans handle adjustments with precision, ensuring the ring maintains its balance and comfort.

Visit our Williamsburg studio to explore this mounting in person or start your custom design journey online—where craftsmanship meets intention in every detail.

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