Lab-Grown Diamond Engagement Ring

Imagine the quiet moment when light catches the soft, rounded corners of a 5 x 5 mm cushion diamond, its gentle glow framed by two smaller stones that echo its modern geometry. This three-stone semi-set engagement ring in platinum balances architectural clarity with subtle warmth, a study in refined structure and confident minimalism.

Crafted in platinum for enduring strength, the mounting features a low-profile setting that keeps the stones close to the finger, enhancing daily wearability without sacrificing brilliance. Each prong is meticulously finished by hand in our Williamsburg studio, ensuring a seamless fit and a comfort curve that feels natural against the skin.

Our commitment to ethical jewelry is reflected in the lab-grown cushion diamond, offering exceptional clarity and sustainability without compromise.

Designed for those who appreciate clean lines and thoughtful detail, this ring complements a variety of hand shapes and pairs effortlessly with stackable bands or wedding rings. Its modest profile makes it glove-friendly and ideal for everyday life.

Should you need resizing, our Brooklyn studio provides expert adjustments to maintain the ring’s integrity and comfort.

Explore this semi-set design in person at our Williamsburg 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 modern aesthetic rooted in New York City’s creative 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.