Lab-Grown Diamond Engagement Ring

When light catches the elongated silhouette of a marquise diamond, it casts a dramatic, tapered sparkle that draws the eye along the finger’s natural line. This semi-set platinum mounting awaits your choice of a 12 x 6 mm center stone, designed to showcase the marquise’s distinctive pointed ends with secure, artisan-crafted prongs.

Hand-forged in our Williamsburg studio, the platinum band offers a cool, substantial feel with a low-profile setting that balances presence and everyday comfort. The subtle accents along the shank add texture without overwhelming the diamond’s architectural shape, while the smooth finish ensures it slips easily under gloves or stacks gracefully with other bands.

Each piece reflects our commitment to ethical jewelry, featuring a setting ready for a lab-grown diamond—offering clarity and brilliance with a smaller environmental footprint.

Ideal for those who appreciate bold geometry paired with refined craftsmanship, this mounting suits a confident hand and a modern aesthetic. Its design supports a center stone that elongates the finger, making it a striking choice for a distinctive engagement ring.

Should you need resizing or custom adjustments, our Brooklyn studio provides attentive care to ensure a perfect fit without compromising the ring’s integrity.

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

Haejin Jewelry stands as a Brooklyn fine-jewelry studio dedicated to expert craftsmanship and ethical lab-grown diamond engagement rings, blending local artisan tradition with contemporary 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.