Beyonce and Jay-Z pose in front of Jean-Michel Basquiat's ​'Equals Pi', a work from 1982. Photo: Tiffany & Co
Beyonce and Jay-Z pose in front of Jean-Michel Basquiat's ​'Equals Pi', a work from 1982. Photo: Tiffany & Co

'Equals Pi': Rare Basquiat painting shown in new Tiffany campaign with Beyonce and Jay-Z