Hi Michelle thank you for your question. there are SO many animal marks on jewelry and many of them look like a lion. However there are not many lion marks that show the lion lying down and that's what makes me suspect it may not be a lion but another animal mark that resembles a lion. Could you attach a photo in a follow-up submission of the mark please.
If a photo is not possible, a drawing of the mark will give us something further to work on.