Born in 1969 in Finsbury Park, London, Leane trained as a classical goldsmith through a seven-year apprenticeship in Hatton Garden, restoring Victorian, Art Nouveau and Art Deco pieces and, by eighteen, making diamond tiaras for houses like Garrard and Asprey. A 1992 introduction to McQueen changed everything: their collaboration produced the aluminium Coiled Corset and the chainmail yashmak, work later shown in Alexander McQueen: Savage Beauty at the Met and the V&A.
Leane founded Shaun Leane Jewellery in 1999, work Sotheby's called "antiques of the future." His pieces have entered the permanent collections of the Met and the V&A, been worn by Björk and Kate Moss, and — when Princess Beatrice named him as the designer of her engagement ring in 2019 — broken with royal tradition. The brand entered administration in 2024.