Lab-Grown Diamond Engagement Ring

Light catches the elongated points of a marquise diamond, casting a slender, graceful shadow across the hand. This semi-set platinum band awaits your choice of a 10 x 5 mm marquise center, designed to showcase the stone’s dramatic taper and refined silhouette.

Crafted in platinum for enduring strength and a cool, luminous finish, the mounting features delicate accent settings that frame the center stone with subtle geometry. The low-profile design ensures the ring sits comfortably beneath gloves or daily wear, while the smooth interior offers a gentle comfort fit.

Each piece is meticulously finished in our Williamsburg studio, where precision meets quiet confidence in every facet and prong. The lab-grown diamond option aligns with a commitment to ethical jewelry, reducing environmental impact without compromising brilliance.

This style suits those who appreciate modern minimalism with architectural clarity—ideal for hands that favor elongated shapes or for stacking alongside a wedding band. The semi-set format invites personal choice, allowing you to select a marquise diamond that reflects your unique story.

Resizing is straightforward, handled expertly in-house to maintain the integrity of the platinum setting. Typical lead times accommodate careful craftsmanship without rush.

Explore this semi-set marquise engagement ring in our Williamsburg studio or begin your custom design journey online, where thoughtful collaboration meets Brooklyn’s artisanal spirit.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert craftsmanship with ethical sourcing and a modern aesthetic rooted in New York City’s creative heart.

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.