Lab-Grown Diamond Engagement Ring

Light catches the elongated silhouette of a marquise diamond, its tapered points drawing the eye like whispered promises. This semi-set three-stone engagement ring foundation in cool platinum awaits your choice of center stone, designed to cradle a 12 x 6 mm marquise with architectural grace.

Crafted with a low-profile setting, the band’s smooth platinum surface balances strength and subtlety, ensuring daily wear feels effortless. Each prong is meticulously shaped and polished in our Williamsburg studio, where precision meets quiet artistry.

Our commitment to lab-grown diamonds means your ring carries clarity and brilliance without compromise, reflecting a modern approach to ethical jewelry.

The slender band complements slender or average finger shapes, offering a comfortable fit that layers beautifully with wedding bands or stackable rings. Its refined silhouette slips easily beneath gloves or sleeves, making it a seamless part of your everyday rhythm.

Should you need resizing or wish to explore custom details, our Brooklyn studio welcomes you to a pressure-free consultation, where your vision guides the process.

Discover the possibilities of this marquise semi-set by visiting us in Williamsburg or starting your custom design online—where craftsmanship and care meet your story.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert craftsmanship with ethical clarity in every piece we create.

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.