Lab-Grown Diamond Engagement Ring

Light catches the elongated marquise shape, casting a subtle sparkle that draws the eye along its tapered points. This semi-set engagement ring frame, crafted in warm 18K rose gold, offers a refined foundation for a 12 x 6 mm marquise diamond, designed to sit low and close to the finger for everyday ease.

The band’s smooth profile and secure prong setting ensure comfort beneath gloves or alongside other stackable pieces, while the rose gold’s gentle blush complements the diamond’s sharp geometry. Each ring is hand-finished in our Williamsburg studio, where precise polishing and inspection guarantee a flawless surface and balanced wearability.

Choosing a lab-grown diamond here reflects a commitment to ethical jewelry, reducing environmental impact without compromising brilliance or clarity.

Ideal for those who appreciate architectural elegance with practical design, this mounting suits slender to medium finger sizes and adapts well to layering with wedding bands or accent rings. Its low profile minimizes snagging, making it a reliable choice for daily wear.

Should you need resizing or prefer a custom fit, our Brooklyn studio offers personalized adjustments with care and expertise.

Explore this semi-set marquise engagement ring in person or begin your custom design journey online—each step guided by thoughtful craftsmanship and local insight.

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 deep connection to 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.