Lab-Grown Diamond Engagement Ring

Imagine the subtle elongation of your hand as a marquise diamond’s tapered silhouette catches the light, its 9 by 4.5 mm facets drawing the eye with quiet drama. This semi-set platinum mounting offers a refined low-profile design, crafted to sit close to the finger for everyday comfort without sacrificing brilliance.

Each ring is meticulously finished in our Williamsburg studio, where the platinum band is hand-polished to a smooth, cool touch and engineered for durability. The setting’s secure prongs cradle your chosen marquise stone, balancing protection with maximum light exposure to enhance sparkle.

Our commitment to lab-grown diamonds ensures clarity and ethical sourcing, reducing environmental impact while maintaining exceptional visual purity. The semi-set format invites you to select a center stone that resonates personally, making this ring a truly bespoke expression.

Designed for those who appreciate a sleek profile, this mounting pairs effortlessly with stackable bands or stands elegantly alone. Its streamlined shape fits comfortably under gloves and daily wear, ideal for an active lifestyle without compromise.

Should you need resizing or wish to explore stone options, our Brooklyn studio offers personalized consultations with transparent timelines and care guidance.

Visit us in Williamsburg or begin your custom design journey online—where expert craftsmanship meets thoughtful, ethical jewelry tailored to your life.

Haejin Jewelry is a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert design with sustainable practices and local artisan care.

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.