These Brand New Figaro Chains Are 100% Guaranteed .925 Solid Sterling Silver " Made In Italy " "Not Hollow-Not Plated-Not Filled"Gram Weights:5mm 5.1 to 18.8 grams depending on length6.2mm 7.6 to 30.7 grams depending on length7.7mm 9.5 to 40.6 grams depending on length10.2mm 15 to 63.8 grams depending on lengthNote: Weights are multiple piece averages