Lab-Grown Diamond Engagement Ring

Light catches the elongated silhouette of a marquise diamond, its pointed ends drawing the eye along a graceful arc. This semi-set engagement ring foundation in 18K yellow gold offers a sleek, modern-minimal frame designed to highlight a 12 x 6 mm marquise center stone of your choosing.

Crafted with precision, the band’s polished surface and secure prong setting balance clarity and structure, ensuring the diamond sits confidently yet comfortably close to the finger. The low-profile design allows for easy stacking or solo wear, while the warm glow of yellow gold complements the stone’s fiery brilliance.

Each piece reflects our commitment to ethical jewelry: the ring is ready to showcase a lab-grown diamond, combining sustainability with exceptional clarity and sparkle.

Ideal for those who appreciate architectural elegance with a contemporary edge, this mounting suits hands that favor elongated shapes and a refined, confident aesthetic. Its subtle accents frame the center stone without distraction, making it a versatile choice for daily wear.

Should you need resizing or prefer a custom finish, our Brooklyn studio offers attentive adjustments and expert guidance throughout the process.

Explore this semi-set marquise ring in our Williamsburg studio or begin your custom design journey online—crafted for life’s defining moments.

Haejin Jewelry stands as a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, where expert craftsmanship meets ethical sourcing and thoughtful design rooted in New York 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.