Lab-Grown Diamond Engagement Ring

Light catches the elongated curve of a marquise diamond, casting a slender, luminous shadow that seems to stretch beyond the hand. This semi-set platinum mounting awaits your choice of a 10 x 5 mm marquise center, designed to cradle the stone with delicate yet secure prongs that emphasize its tapered drama.

Crafted in Williamsburg, the band’s polished platinum offers a cool, substantial feel against the skin, finished with a low-profile setting that slips comfortably beneath gloves and stacks effortlessly with other bands. The solitaire design honors simplicity, allowing the marquise’s distinctive shape to command quiet attention.

Each piece reflects our commitment to ethical jewelry, featuring lab-grown diamonds that offer clarity and brilliance without compromise. The mounting’s refined silhouette suits those who appreciate a blend of modern geometry and everyday wearability.

Should you need resizing or prefer a custom finish, our Brooklyn studio provides attentive, pressure-free consultations to ensure your ring fits seamlessly into your life. Typical lead times accommodate thoughtful craftsmanship without rush.

Explore this semi-set marquise solitaire in person at our Williamsburg studio or begin your custom design journey online—where expert guidance meets Brooklyn’s artisanal spirit.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, where ethical craftsmanship and local expertise shape every creation.

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.