The meaning of Locket tattoo is to collect secrets and good memories. The popularity of Locket can be traced back to the Renaissance. At first, Locket was not worn as a necklace, but hung at the waist with other accessories to store the hair of the loved one. With the development of time and the popularity of photography, people began to get used to hiding the photos of their loved ones in lock boxes and wearing them as necklaces.
Locket was very popular in the 19th century. The most classic way to wear it was a lock on a black velvet ribbon. In 1997, Anna Karenina and Betsy brought a classic black velvet ribbon and lock at the party. People like to hide photos or lovers' hair on the pendant side of this necklace, so lock is a place to collect secrets and exclusive memories.
Source: @monolithtattoo615