Lab-Grown Diamond Engagement Ring

Imagine the elongated silhouette of a marquise diamond catching the light as it moves with your hand—its tapered points lending a subtle drama without excess. This semi-set platinum mounting awaits your choice of a 12 x 6 mm marquise center, designed to sit low and close to the finger for everyday ease.

Crafted in platinum for enduring strength, the setting features a secure prong arrangement that balances protection with maximum light exposure. The band’s smooth comfort fit and modest profile make it glove-friendly and ideal for stacking alongside wedding bands or delicate bracelets.

Each piece reflects a commitment to sustainability, housing a lab-grown diamond that offers clarity and brilliance with a smaller environmental footprint. The marquise shape’s distinctive geometry elongates the finger, flattering a variety of hand sizes and styles.

Should you require resizing, our Brooklyn studio handles adjustments with precision to maintain the ring’s structural integrity. Typical lead times accommodate careful finishing and inspection, ensuring a piece ready for daily life.

Visit us in Williamsburg or begin your custom design journey online—experience how thoughtful craftsmanship and ethical materials come together in a ring made for your story.

Haejin Jewelry is a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert design with ethical craftsmanship 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.

Finished for daily wear — a low-profile silhouette and polished edges help minimize snagging.