10K yellow gold flat box chain La Bote Bijoux 10k Yellow Gold Box Chain 18" LUXURMAN Solid 10K Yellow Gold Box Chain For Men & Women Octagonal 1 10k Yellow Gold 0.6 mm Box Chain Necklace (16 24 inch) Overstock Solid Box Chain Necklace 10K Yellow Gold 20 Length 0.5mm Jared. 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