Lab-Grown Diamond Engagement Ring

Sunlight catches the elongated silhouette of an 8 x 4 mm marquise diamond, its tapered points drawing the eye along a graceful arc. This semi-set three-stone ring foundation in platinum offers a sleek, low-profile frame, meticulously crafted in our Williamsburg studio to balance bold geometry with everyday wearability.

The platinum band is hand-finished to a satiny smoothness, designed for comfort fit and subtle resilience. Its setting style allows you to select a center stone that complements the sharp elegance of the marquise shape—known for its dramatic, tapered drama that elongates the finger with refined poise.

Each piece reflects our commitment to ethical jewelry: the ring is crafted to hold a lab-grown diamond, ensuring clarity and brilliance without compromise to sustainability.

Ideal for those who appreciate architectural lines and a ring that layers effortlessly with stackable bands or stands strikingly alone. The low-profile mounting slips easily under gloves and daily wear, making it a practical choice for a modern lifestyle.

Should you need resizing or guidance on selecting the perfect center stone, our Brooklyn studio offers personalized consultations with no pressure and expert advice.

Explore this semi-set marquise engagement ring in person at our Williamsburg workshop or begin your custom design journey online—crafted for your story, shaped by Brooklyn’s artisan spirit.

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 local, hands-on design experience.

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.