Lab-Grown Diamond Engagement Ring

Sunlight catches the elongated silhouette of a marquise diamond, casting a slender beam that seems to stretch across the hand. This solitaire semi-set ring features a 9 x 4.5 mm marquise stone, poised to become the centerpiece of your custom design.

Crafted in warm 18K yellow gold, the mounting is engineered for everyday wear with a low-profile setting that keeps the diamond secure yet unobtrusive. The band’s smooth finish and balanced weight ensure a comfortable fit, ideal for those who prefer subtle elegance without compromising durability.

Each lab-grown diamond is selected for clarity and brilliance, reflecting a commitment to sustainable luxury without sacrificing visual impact. The ethical origin of the stone aligns with a mindful approach to fine jewelry.

This solitaire style suits hands that appreciate architectural grace, with the marquise shape elongating fingers and adding a refined statement. Its semi-set status invites you to choose a center stone that matches your vision, ensuring a truly personal expression.

Should resizing be needed, our Brooklyn studio offers expert adjustments to maintain the ring’s integrity and comfort.

Explore this semi-set marquise solitaire in person at our Williamsburg studio or begin your custom design journey online—crafted for life’s most meaningful moments.

Haejin Jewelry stands as a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, combining expert craftsmanship with ethical sourcing and a dedication to thoughtful design.

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.