Lab-Grown Diamond Engagement Ring

Light catches the elongated points of a marquise diamond, casting a subtle, tapered glow that draws the eye along the finger’s natural line. This semi-set platinum mounting awaits your choice of a 6 x 3.5 mm marquise center, designed with a low-profile silhouette that slips comfortably beneath daily gloves and sleeves.

Crafted in Williamsburg, Brooklyn, the band’s sleek platinum finish is polished to a soft sheen, while the setting’s precise prongs secure your stone with minimal metal visible, emphasizing the diamond’s distinctive shape. The mounting’s balanced weight and smooth interior ensure a comfort fit, ideal for everyday wear without compromise.

Each piece reflects our commitment to ethical jewelry, featuring lab-grown diamonds that offer clarity and brilliance with a smaller environmental footprint.

Its streamlined design suits hands that appreciate subtle elegance and works well alongside stackable bands or as a standalone statement. The semi-set style invites personalization, allowing you to select a marquise diamond that resonates with your vision.

Should resizing be needed, our in-studio experts handle adjustments with care to preserve the mounting’s integrity and finish.

Explore this semi-set marquise engagement ring in our Williamsburg studio or begin your custom design journey online, where expert guidance meets thoughtful craftsmanship.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio dedicated to lab-grown diamond engagement rings, blending ethical craftsmanship with local artistry 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.