Jessica McCormack is a London-based diamond jewellery brand renowned for its distinctive antique-meets-modern aesthetic. Both female-led and fast-growing, the brand has more than tripled its turnover from £9 million in 2020 to over £30 million in 2024. In recent years, the brand has gained significant international traction, attracting a loyal following of influential clients, including celebrities, collectors, and female entrepreneurs. In 2025, Jessica McCormack expanded its global footprint with the opening of its first international store on Madison Avenue in New York City, marking its entry into the U.S. market, and launched its first concession store in London’s world-famous Harrods.

Known for creating truly wearable ‘Day Diamonds’, Jessica McCormack pieces are designed to be worn every day and passed down through generations. Craftmanship is at the heart of the brand, with the jeweller’s in-house workshop living on site at the brand’s Townhouse flagship store in the heart of London’s Mayfair.

The brand continues to service clients all over the world online, in London at 7 Carlos Place, 140 Sloane Street, and Harrods, and in New York at 743 Madison Avenue.