My name is ***** ***** I would love to help. I see the one photo of the earrings. I would also need to see a photo or have you describe the marks on the earrings. There should be gold assay mark of 10k 14k or 18k , European gold is marked 585 (14k) or 750 (18k) or is sometimes marked with symbolic pictures for gold assay. There is sometimes a maker's initials or logo monogram also.
You can use the Add Files feature to add pictures of these marks. I know that it is hard to photograph such small marks, so a description will also be fine.