Lab-Grown Diamond Engagement Ring

When light catches the elongated points of the marquise, it carves a silhouette that feels both bold and refined. This semi-set halo engagement ring foundation in platinum offers a low-profile setting designed to cradle an 8 x 4 mm marquise diamond securely, balancing brilliance with everyday practicality.

Crafted in platinum for its enduring strength and subtle sheen, the mounting features a halo setting that enhances the stone’s tapered drama while maintaining a sleek profile close to the finger. The band’s smooth finish and precise prong work ensure comfort and durability, ideal for daily wear without catching or snagging.

Each piece reflects our commitment to ethical jewelry, showcasing lab-grown diamonds that deliver clarity and sparkle with a smaller environmental footprint. The marquise shape’s elongated form visually lengthens the finger, making it a striking choice for those who appreciate architectural elegance paired with modern sensibility.

Designed for hands that value both style and function, this mounting suits a variety of finger sizes and complements stacking with other bands thanks to its streamlined silhouette. Resizing is available to ensure a perfect fit, and the studio’s expert finishing guarantees a flawless result.

Explore this semi-set halo in our Williamsburg studio or begin your custom design journey online—where expert guidance meets Brooklyn craftsmanship.

Haejin Jewelry stands as a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert craftsmanship with ethical sourcing and a distinctly local design ethos.

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.