Tiffany By the Yard Including the bezel, it's a large stone, over 5.5mm. Chain: 42cm Total weight: Approximately 2.5g I purchased this several years ago from a pawn shop. It comes with a purchase certificate from the Tiffany & Co. store in Daimaru Umeda, purchased on January 22, 2003. A Tiffany black box and case are also included. Due to the large diamond, it has a serial number. I have hidden it in the photos. Other engravings: TIFFANY&CO PT950 PERETTI Platinum 950 After purchasing this item, which had been newly polished at a used goods store, I hardly used it, so it's as good as new and sparkling clean. The large diamond sparkles brightly and beautifully. Thank you.