Lab-Grown Diamond Engagement Ring

When light catches the elongated curves of a marquise diamond, it sketches a slender silhouette that seems to float above the finger, evoking quiet drama and refined grace. This semi-set platinum mounting awaits your choice of a 6 x 3.5 mm marquise center, designed to cradle the stone securely in a solitaire setting that balances presence with subtlety.

Crafted in platinum for its enduring strength and cool luster, the band is polished to a satin finish that feels smooth against the skin. The low-profile prongs hold the diamond close to the hand, making it comfortable for daily wear and easy to pair with a wedding band or stackable rings.

Each piece reflects our commitment to ethical jewelry: the marquise diamond you select will be lab-grown, offering clarity and brilliance with a smaller environmental footprint. This choice aligns with a modern approach to sustainability without compromising on radiance.

Ideal for those who appreciate a distinctive shape that elongates the finger and complements slender hands, this solitaire frame is equally suited to a minimalist aesthetic or a layered look. Its refined silhouette slips effortlessly beneath gloves and fits comfortably for everyday life.

Should you need adjustments, resizing is straightforward and handled with care in our Williamsburg studio, ensuring your ring fits perfectly over time.

Explore this semi-set marquise solitaire in person at our Brooklyn studio or begin your custom design journey online—where craftsmanship meets intention in every detail.

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 distinctly local sensibility.

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.