Lab-Grown Diamond Engagement Ring

Light catches the elongated silhouette of a marquise diamond, its tapered points drawing the eye along the finger with a subtle, sculptural grace. This semi-set halo engagement ring foundation in cool platinum offers a refined stage for a 6 x 3.5 mm marquise center stone, framing it with delicate pavé that enhances brilliance without overwhelming the shape’s distinctive drama.

Handcrafted in our Williamsburg studio, the platinum band is polished to a satin-smooth finish, designed for daily wear with a low-profile setting that rests comfortably close to the finger. The halo setting balances sparkle and structure, while the semi-set state invites you to select a lab-grown marquise diamond that meets your clarity and color preferences.

Each piece reflects our commitment to ethical jewelry: lab-grown diamonds reduce environmental impact without sacrificing optical performance or craftsmanship integrity.

The slim band suits slender to medium finger sizes and pairs effortlessly with wedding bands or stackable rings, its comfort fit ensuring ease beneath gloves or during everyday tasks.

Should you need resizing or guidance on selecting the ideal marquise cut, our Brooklyn studio offers personalized consultations to ensure your ring fits perfectly and shines brilliantly.

Explore this semi-set halo foundation in person or begin your custom design journey online with Haejin Jewelry, where expert craftsmanship meets ethical clarity in the heart of Williamsburg.

Haejin Jewelry stands as a Brooklyn fine-jewelry studio specializing in lab-grown diamond engagement rings, blending expert design, ethical sourcing, and artisan skill to create pieces made for life’s most meaningful moments.

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.