The item is a sterling silver onyx and white agate necklace. The necklace can be worn with the white agate facing out or the onyx. The stones drop down 2 3/4 inches giving the necklace the look of a 20 inch long necklace. The part of the necklace that goes around your neck is 16 inches long. The largest piece on the bottom measures 20 millimeters long and 12 millimeters wide. This item weighs 13.9 grams. The necklace has a lobster claw catch. We will provide a necklace box.