A diamond locket is a jewelry piece that hinges open to reveal one or two small photos of a loved one. Lockets are a form of pendant, which are removable jewelry pieces that are strung on an unadorned necklace.

Diamond lockets usually feature one or more small diamonds flush mounted on the face of the locket. The most popular shapes are round lockets, oval lockets, and heart shape lockets.

Cameo lockets feature a cameo instead of diamonds on the face of the locket.