Ari's granddaughter auctioning mom's collection
                                
                                
                                    (Newser) -
                                    The granddaughter and only surviving descendant of Aristotle Onassis is selling the family treasures. Athina Roussel, 23, is auctioning off her $16 million jewelry collection, including a $4.4 million 38-carat diamond, and a Faberge Buddha valued at  $700,000, reports the New York Daily News.