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 fingers with quiet elegance. This semi-set platinum band awaits your choice of a 7 x 3.5 mm marquise center, designed to cradle the stone with slender prongs that lift it just above the finger, allowing light to flood every facet.

Crafted in platinum for enduring strength and a cool, luminous finish, the mounting features a low-profile setting that balances presence with everyday comfort. The band’s smooth interior offers a comfort fit, making it a natural companion for daily wear or stacking alongside a wedding band.

Each lab-grown diamond chosen for this setting reflects a commitment to ethical sourcing and sustainability, offering clarity and brilliance without compromise. The marquise shape’s tapered points create a striking visual drama, elongating the hand with a refined, architectural grace.

Ideal for those who appreciate subtle statement pieces that blend modern geometry with timeless romance, this solitaire setting invites personalization and thoughtful pairing. Resizing is available to ensure a perfect fit, crafted with care in our Williamsburg studio.

Explore this semi-set marquise solitaire in person or begin your custom design journey online—where Brooklyn craftsmanship meets conscious luxury.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, where expert craftsmanship and ethical design converge in every piece made for life’s most intimate 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.