"We lost our mother and best friend, and the world lost an enduring symbol of grace, elegance and humanity," her sons Luca Dotti and Sean Hepburn Ferrer say on the Christie's website . "We preserved our feelings for her as well as her belongings, each of which signified her life’s choices and philosophy. After 24 years we have focused on those items that we wished to keep, as well as those we are pleased to pass on to future generations."