Lab-Grown Diamond Engagement Ring

When light catches the elongated curves of a marquise diamond, it creates a quiet drama that seems to stretch beyond the hand. This semi-set platinum mounting awaits your choice of a 5 x 3 mm marquise center, designed to cradle the stone with slender prongs that lift it just enough to catch every flicker of brilliance without excess height.

Crafted in our Williamsburg studio, the band’s polished platinum offers a cool, substantial feel that balances durability with refined comfort. Its low-profile silhouette slips easily beneath gloves or alongside a wedding band, making it a natural for daily wear. Each piece is meticulously finished and inspected to ensure a seamless fit and enduring shine.

Our commitment to lab-grown diamonds means your ring carries a clarity and sparkle born from sustainable practices, reflecting a modern approach to ethical jewelry.

Ideal for those who appreciate a blend of classic elegance and subtle individuality, this solitaire setting complements the marquise’s tapered shape, elongating the finger with a graceful, architectural presence.

Should you need resizing or wish to explore custom adjustments, our Brooklyn studio offers personalized consultations to ensure your ring fits perfectly.

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

Haejin Jewelry is a Brooklyn-based fine-jewelry studio specializing in lab-grown diamond engagement rings, where expert craftsmanship meets ethical values in every piece created 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.