Sterling Silver One Sided Open Text Book Necklace Oxidized Sterling Silver Charm Approximately 10 mm 12 mm (0.4 inch x 0.47 inch) Charm Weighs Approximately 1.7 grams (3.4 grams including 16" necklace) High Polished Box Chain Thickness Approximately 0.7 millimeters (1/32 inch) Spring Clasp on Necklace