Lab-Grown Diamond Engagement Ring

Light catches the elongated silhouette of a marquise diamond, its tapered points drawing the eye along a sleek, architectural line. This semi-set three-stone engagement ring in platinum offers a refined framework, ready to cradle a 9 x 4.5 mm marquise center with quiet confidence.

Crafted in platinum for enduring strength and a cool, luminous finish, the mounting features a low-profile setting that balances presence with everyday wearability. Each prong is meticulously shaped and polished in our Williamsburg studio, ensuring the band feels smooth against the skin and complements stacking or solo wear.

Choosing a lab-grown diamond here means embracing clarity and brilliance without compromise, reflecting a commitment to sustainable luxury. The three-stone design adds dimensionality while maintaining a modern-minimal aesthetic, ideal for those who appreciate structured elegance.

This ring suits hands that favor elongated shapes, enhancing finger length with its marquise centerpiece. Its comfort fit and subtle profile make it glove-friendly and versatile for daily life.

Should you need resizing or prefer a custom stone cut, our Brooklyn studio offers personalized consultations to guide your choice and timeline.

Explore this semi-set marquise engagement ring in person at our Williamsburg studio or begin your custom design journey online—crafted for those who value clarity, structure, and ethical craftsmanship.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert design with ethical sourcing and local craftsmanship in New York City.

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.