Lab-Grown Diamond Engagement Ring

Light catches the elongated silhouette of a marquise diamond, its tapered points drawing the eye along a refined, architectural line. This semi-set platinum mounting awaits your choice of a 6 x 3.5 mm marquise center, designed to cradle the stone securely while maintaining a sleek, low-profile presence.

Crafted in platinum for enduring strength and subtle weight, the band features a streamlined solitaire setting that balances technical precision with everyday comfort. Its low profile ensures the ring sits close to the finger, minimizing snagging and allowing for effortless wear alongside other bands.

Each piece reflects our commitment to ethical jewelry, showcasing lab-grown diamonds that offer clarity and brilliance without compromise. This mounting’s design suits those who appreciate a modern silhouette with architectural grace, especially flattering on slender fingers or anyone seeking a distinctive yet understated engagement ring.

Should you need resizing or prefer a custom finish, our Williamsburg studio offers personalized consultations to ensure your ring fits seamlessly into your daily life. Lead times are transparent and tailored to your design choices.

Explore this semi-set marquise solitaire in person at our Brooklyn studio or begin your custom design journey online—crafted for those who value precision, comfort, and ethical artistry.

Haejin Jewelry stands as a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert craftsmanship with sustainable practices to create pieces made for life’s most meaningful moments.

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.