Lab-Grown Diamond Engagement Ring

Sunlight catches the elongated silhouette of a marquise diamond, casting a slender, dramatic shadow across the hand. This semi-set platinum solitaire ring invites you to choose a center stone that measures a striking 12 by 6 millimeters, its tapered points lending an elegant, vintage-inspired flair.

Crafted in our Williamsburg studio, the mounting features a refined low-profile setting that balances presence with everyday comfort. The platinum band is hand-polished to a satin finish, offering subtle resilience against daily wear while maintaining a quiet glow. Its slender shank and secure prongs are designed to cradle the marquise shape delicately, ensuring the stone’s architectural drama remains the focal point.

Each lab-grown diamond option embodies clarity and brilliance without the environmental cost of traditional mining, reflecting our commitment to thoughtful, ethical jewelry.

This solitaire suits those who appreciate a statement piece that remains wearable—its slim profile fits comfortably beneath gloves and stacks gracefully with wedding bands or delicate accent rings. The elongated marquise shape visually lengthens the finger, ideal for hands seeking a refined yet bold expression.

Should you need resizing, our in-house artisans tailor each band with precision, ensuring a seamless fit without compromising the ring’s integrity.

Explore this semi-set marquise solitaire in person at our Williamsburg studio or begin your custom design journey online, where expert guidance awaits.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio dedicated to crafting lab-grown diamond engagement rings with meticulous care, ethical integrity, and a deep connection to New York City’s artisan 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.