Our 2mm dapped sterling silver chain necklace is shown at roughly 18" long. It's been affixed with a handcrafted black agate cabochon. The cabochon is roughly 7/8" in diameter. The bezel is made of 925 sterling silver crown wire.The piece is handcrafted, so no two will be the same. Take pride in knowing that your necklace is one of a kind. NOTE: Each piece is in its natural state. It’s not coated with anything to prevent tarnish. Oils, lotions, moisture, etc. will accelerate the tarnish, so its recommended that you use a jewelry cloth for cleaning after wearing your jewelry. Choking Hazard - Small PartsWARNING: CHOKING HAZARD—Small partsNot intended for children.