This sterling silver necklace has a square black faceted onyx set in it. The pendant itself is approx. 1 1/2 inches long by 1 1/4 inches wide. The frame around the setting is hand stampedIt is on a 18 inch box chain. Other chains lengths are available upon request. I have 16,18 and 20 inch chains. Just send me a convo. This is a one of a kind piece..