Lab-Grown Diamond Engagement Ring

When light catches the elongated silhouette of a marquise diamond, it draws the eye along a graceful arc—like a whispered promise. This semi-set halo engagement ring foundation in cool platinum frames a 12 x 6 mm marquise center with delicate pavé accents, ready to cradle your chosen stone in a luminous embrace.

Crafted in Williamsburg, the band’s low-profile setting balances presence with everyday ease, its smooth platinum surface polished to a subtle sheen that feels weightless on the finger. The halo design amplifies brilliance while maintaining a refined silhouette, ideal for stacking or wearing solo with quiet confidence.

Each piece reflects our commitment to ethical jewelry: lab-grown diamonds offer clarity and sparkle without compromise, aligned with sustainable values and mindful sourcing.

Designed for those who appreciate architectural elegance softened by romantic detail, this mounting suits hands that welcome a statement with grace—its comfort fit and glove-friendly profile ensure it moves seamlessly through daily life.

Should you wish to adjust sizing or explore center stone options, our Brooklyn studio offers personalized guidance and expert finishing, typically within a few weeks.

Visit us in Williamsburg or begin your custom design journey online—let this marquise halo semi-set become the canvas for your story.

Haejin Jewelry is a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, where ethical craftsmanship meets thoughtful design in every piece we create.

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.