Lab-Grown Diamond Engagement Ring

Light catches the elongated silhouette of a marquise diamond, its tapered points tracing a delicate arc that seems to stretch the hand with quiet elegance. This semi-set halo engagement ring foundation in polished platinum invites your choice of a 6 x 3 mm lab-grown marquise, ready to be framed by a halo that amplifies its subtle drama.

Crafted with a low-profile setting, the platinum band balances strength and grace, its smooth finish designed for everyday wear without catching or discomfort. The halo setting, once completed, will add a whisper of sparkle that enhances the marquise’s signature brilliance and elongation.

Each lab-grown diamond is selected for clarity and ethical provenance, reflecting a commitment to sustainability without compromise. The cool sheen of platinum complements the stone’s glassy facets, creating a refined contrast that feels both modern and enduring.

This ring suits those who appreciate architectural beauty with a romantic edge—its slender silhouette fits comfortably beneath gloves and stacks effortlessly with other bands. The semi-set design allows for personalized stone selection, ensuring your engagement ring is uniquely yours.

Resizing is available to ensure a perfect fit, and our Brooklyn studio welcomes you to explore custom options in person or through our online design experience.

Haejin Jewelry specializes in lab-grown diamond engagement rings crafted in Williamsburg, Brooklyn, where expert artisans blend ethical craftsmanship with modern design. Our studio is dedicated to creating pieces that resonate with your story and the city’s creative 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.