This is a genuine Platinum and Diamond Elsa Peretti Bean Necklace. It is 12mm and has a carat weight of.24, with a length of 16". Only serious offers will be considered, sorry no trades. I can personally ensure item is authentic. Item has original product packaging consisting of a felt case and famous blue box. I will certainly even tie the ribbon for you (Tiffany style). Retail for this product was $3,100.