Lab-Grown Diamond Engagement Ring

Sunlight catches the elongated points of a marquise diamond, casting a slender, dramatic silhouette that seems to stretch the hand with quiet elegance. This semi-set three-stone engagement ring foundation in platinum invites your choice of a 6 x 3 mm marquise center, framed by two delicately crafted side stones that balance brilliance with architectural grace.

Each band is meticulously forged in our Williamsburg studio, where the platinum is hand-polished to a satin-smooth finish that feels substantial yet comfortable against the skin. The low-profile setting ensures daily wearability without catching, while the three-stone design offers a harmonious interplay of light and shadow, emphasizing the marquise’s tapered drama.

Our diamonds are lab-grown, reflecting a commitment to ethical sourcing and environmental mindfulness without compromising on clarity or fire.

This ring suits those who appreciate refined geometry and a silhouette that elongates the finger, ideal for stacking with slender bands or worn solo for understated impact. The comfort fit band adapts gracefully to daily life, from quiet mornings to evening celebrations.

Should you wish to adjust sizing, our in-studio experts provide precise, seamless resizing to ensure a perfect fit.

Explore this semi-set marquise engagement ring in person at our Williamsburg workshop or begin your custom design journey online—crafted for your story, shaped by Brooklyn hands.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio dedicated to lab-grown diamond engagement rings, blending expert craftsmanship with ethical clarity and a deep connection to New York City’s artisan spirit.

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.