Known for his resplendent Sabyasachi brides, ace fashion designer Sabyasachi Mukherjee carries forward his ideas about sustainability and luxury into a new jewellery line. Here, he talks about his latest jewellery collection in continued partnership with Bergdorf Goodman, how his aesthetic oscillates between maximal and minimal, his effort to preserve Indian jewellery craftsmanship, and a possible pre-Oscars exhibit.