Buy 10k Yellow Gold Venetian Box Chain 22 26 Inch 3.5mm Online at SO 10k Yellow Gold Classic Box Chain (0.45 mm) 10K yellow gold flat box chain La Bote Bijoux 10k Yellow Gold Box Chain 18". This classic box chain comes in 10k yellow gold and has a width of 0. 45 millimeters. Product Details: Chain Information : Metal : 10K Yellow Gold Chain Type : Box Clasp : Spring Ring Width : 0. 45 mm Approximate Weight: Size Weight 16'' 0. 6 grams 18'' 0. 75 grams 20'' 0. 8 grams