Sterling Silver Cowgirl Earrings with Turquoise

My 10 year old bought these at auction with her own money. They were sold as Sterling Silver, made by a small artist, I think her name is Melanie Starvas? They are not marked sterling, but aren’t required as a one of a kind item, however they passed auction test, jingle, smell, and polish test and are not magnetic (sterling 925 is not magnetic). They feature, as shown, a horse, cattle skull, and revolver. Similar handmade one of a kind earring are priced around $75.