Lab-Grown Diamond Engagement Ring

Light catches the elongated silhouette of a marquise diamond, its pointed ends tracing a delicate arc that seems to stretch the hand with quiet elegance. This semi-set platinum mounting awaits your choice of a 6 x 3 mm marquise stone, designed to cradle the gem securely while showcasing its signature tapered drama.

Crafted in Williamsburg, the band’s polished platinum offers a cool, substantial feel, balanced by a low-profile setting that slips comfortably beneath gloves and layers seamlessly with other bands. The solitaire style emphasizes the stone’s unique shape, allowing its brilliance to command attention without distraction.

Each piece reflects a commitment to ethical jewelry, featuring lab-grown diamonds that combine clarity with sustainability. This ring suits those who appreciate refined geometry and a design made for daily wear, its slender silhouette flattering slender to medium finger sizes.

Should you need resizing or prefer a different stone size, our Brooklyn studio offers personalized consultations to ensure your ring fits perfectly and reflects your vision. Lead times are transparent, with careful hand-finishing and inspection before delivery.

Explore this semi-set marquise solitaire in person at our Williamsburg studio or begin 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, blending expert craftsmanship with ethical sourcing to create pieces that resonate with modern love and local artistry.

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.