Here's a gold fill version of another much more expensive locket we have in 18k gold. Obviously it was a popular thing to own in the 1880s, and this one IMO has an even cuter detail - the belt motif "arms" that come up over the locket to secure the expanding half of the globe closed. Original frames and celluloid lenses are intact, but the lenses are slightly yellowed. Dealer tip - you can replace them with plastic cut from contemporary food packaging.
1837 — 1901
It’s hard to pinpoint when modern-day lockets were invented, but it’s believed that they evolved from ancient amulets.