Unknown Brand Sterling and Lapis Drop Earrings. Sold to me as Lapis I don’t know

Unknown Brand Sterling and Lapis Drop Earrings. Sold to me as Lapis I don’t know how to validate if it’s really Lapis. I once took a lot of expensive jewelry into sell for melting and the dealer told me that most gemstones are created vs. natural. Definitely silver because they were polished. Ty