Lab-Grown Diamond Engagement Ring

Imagine the subtle elongation of your hand as a marquise diamond begins its quiet conversation with light—7 by 3.5 millimeters of pointed elegance, ready to captivate. This semi-set platinum solitaire ring offers a refined foundation, crafted to cradle your chosen stone with precision and a low-profile silhouette that slips comfortably beneath daily gloves or sleeves.

Each platinum band is hand-finished in our Williamsburg studio, polished to a soft sheen that resists wear while maintaining a sleek, modern edge. The mounting’s streamlined design ensures the ring sits close to the finger, enhancing comfort without sacrificing the diamond’s dramatic presence.

Our commitment to lab-grown diamonds means your center stone will carry the clarity and brilliance of natural origins, with a fraction of the environmental impact.

Ideal for those who appreciate architectural lines and a ring that integrates seamlessly with everyday life, this setting supports a marquise shape that visually elongates the finger, balancing boldness with subtlety.

Should you need resizing or prefer a custom finish, our Brooklyn studio offers personalized consultations to ensure your ring fits flawlessly.

Explore this semi-set marquise solitaire in person or begin your custom design journey online—either way, you’ll experience the thoughtful craftsmanship that defines Haejin Jewelry.

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 commitment to local artistry.

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.