Lab-Grown Diamond Engagement Ring

Imagine the subtle drama of a marquise diamond, its elongated silhouette catching light with a quiet intensity that draws the eye along the finger’s natural line. This semi-set engagement ring foundation in 18K yellow gold offers a sleek, modern-minimal frame designed to highlight a 9 x 4.5 mm marquise center stone of your choosing.

Crafted in Williamsburg, the band’s smooth finish and gently tapered shoulders provide a comfortable fit that sits low against the hand, ideal for daily wear and effortless stacking. The setting’s clean lines and secure prong structure balance architectural clarity with refined confidence, allowing the diamond’s facets to sparkle unhindered.

Each piece reflects our commitment to ethical jewelry through lab-grown diamonds, marrying sustainability with exceptional craftsmanship. The warm glow of 18K yellow gold complements the marquise’s dramatic shape, enhancing its vintage-inspired elegance with a contemporary edge.

Designed for those who appreciate structure and clarity, this mounting suits slender to medium finger sizes and pairs beautifully with complementary bands or accent stones. Resizing is available to ensure a precise fit, and our studio welcomes custom consultations to tailor every detail.

Explore this semi-set marquise ring in person at our Williamsburg studio or begin your custom design journey online—where thoughtful craftsmanship meets modern romance.

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

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.

Finished for daily wear — a low-profile silhouette and polished edges help minimize snagging.