Graduated Diamond Tennis Necklace 27.16ctRound brilliants totaling 27. 16 carats step up in size from the back of the neck to the center in 18K white gold, the three prong construction keeping each stone open and bright across the full length. The graduating scale gives the necklace a natural focal point that a uniform line cannot replicate. For the anniversary table, the wedding day or the gift that marks something permanent.