The In the Know Jewelry Brand Beloved By Cool Girls

Why It Matters

McCormack’s blend of celebrity endorsement and accessible, everyday‑wear diamonds is reshaping luxury retail, driving demand for high‑end pieces that fit casual wardrobes. The U.S. expansion positions the brand to capture a broader market share in the booming American luxury jewelry sector.

Key Takeaways

• Jessica McCormack launched first U.S. store on Madison Avenue, 2025
• Gypset hoop earrings are brand’s best‑selling, customizable diamond piece
• Celebrity clientele includes Zendaya, Emma Stone, Margot Robbie, Zoe Kravitz
• Expansion plans include South Coast Plaza store opening summer 2026

Pulse Analysis

Jessica McCormack’s rise illustrates how independent designers can leverage celebrity cachet to disrupt the traditional luxury jewelry hierarchy. Growing up in New Zealand with early exposure to antiques, she honed her gem expertise at Sotheby’s before opening a modest, appointment‑only shop in London’s Clerkenwell in 2008. Within a decade, her clientele expanded from early adopters like Rihanna to A‑list stars, culminating in high‑visibility moments such as Zendaya’s 2025 Golden Globes engagement ring. This narrative underscores the power of personal branding and artisanal storytelling in a market dominated by legacy houses.

At the core of McCormack’s appeal is a design ethos that makes diamonds feel “truly wearable.” The Gypset hoop earrings, with their simple gold base and dangling diamonds, exemplify this approach, offering customizable carat weights that suit both casual denim looks and formal attire. By integrating antique techniques—such as Georgian cut‑down settings—into contemporary silhouettes, the brand satisfies a growing consumer desire for heritage‑infused, yet versatile luxury. This aligns with broader industry trends where shoppers prioritize pieces that transition across settings, driving higher repeat purchase rates.

Strategically, the brand’s expansion into New York’s Madison Avenue and the upcoming South Coast Plaza location signals confidence in the U.S. luxury market’s resilience. Celebrity endorsements amplify brand visibility, while the in‑house workshop ensures control over quality and supply chain agility. As American consumers increasingly seek boutique experiences over mass‑market luxury, McCormack’s model—combining craftsmanship, celebrity influence, and accessible everyday elegance—positions it to capture a larger slice of the $80 billion U.S. diamond market. Continued geographic growth could also inspire similar independent jewelers to pursue upscale retail footprints.