Lab-Grown Diamond Engagement Ring

Sunlight catches the elongated silhouette of a marquise diamond, its tapered points drawing the eye along the finger with subtle drama. This semi-set platinum mounting awaits your choice of a 10 x 5 mm marquise center, designed to showcase the stone’s distinctive brilliance and graceful shape.

Handcrafted in our Williamsburg studio, the band features delicate accent settings that balance refined artistry with everyday wearability. The platinum’s cool sheen complements the marquise’s fiery facets, while the low-profile design ensures comfort beneath gloves or alongside stackable bands.

Each piece reflects our commitment to ethical jewelry, crafted exclusively for lab-grown diamonds that offer clarity and sustainability without compromise. The mounting’s precise finish and secure prongs promise a lasting embrace for your chosen gem.

Ideal for those who appreciate architectural elegance with a modern edge, this setting suits slender to medium finger sizes and pairs effortlessly with minimalist or statement styles. Resizing is available to ensure a perfect fit.

Explore this semi-set marquise engagement ring in person at 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 specializing in lab-grown diamond engagement rings, blending expert design, ethical sourcing, and local artisan skill to create pieces made for a lifetime.

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.