Lab-Grown Diamond Engagement Ring

When light catches the elongated facets of a marquise diamond, it creates a subtle dance of brilliance that seems to stretch beyond the finger’s curve. This semi-set three-stone engagement ring in platinum frames a 10 x 5 mm marquise center with two delicate side stones, each carefully nestled in a low-profile setting that balances presence with everyday grace.

Crafted in platinum for its enduring strength and cool luster, the band is polished to a satin finish that feels smooth against the skin, designed with a comfort fit that suits daily wear without compromise. The prongs are precisely shaped to secure the marquise’s pointed ends while allowing maximum light to animate the stone’s signature silhouette.

Each diamond is lab-grown, offering a clarity and sparkle that honors both ethical sourcing and environmental mindfulness, reflecting a modern approach to fine jewelry.

This ring complements hands that appreciate refined geometry and subtle drama, its slender profile making it ideal for stacking or pairing with a wedding band. The elongated marquise shape visually lengthens the finger, lending an elegant, architectural grace.

Should you need resizing, our Brooklyn studio offers expert adjustments to ensure a perfect fit without disrupting the ring’s delicate balance.

Explore this design in person at our Williamsburg studio or begin your custom journey online—where craftsmanship meets thoughtful intention in every detail.

Haejin Jewelry is a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, where ethical craftsmanship and local expertise converge to create pieces made for a lifetime.

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.