I used to work in jewelry. When a customer came up to me and wanted to buy something with no UPC, I looked to make sure the little tag didn't fall of in the case or on the floor. Some of the tags aren't attached to the merchandise very good. She didn't even bother looking, nor did she attempt to solve the problem in another manner.
I know I am an employee there, but when I am making a big purchase, I except to be treated like a regular customer. I told her to forget it and left. If talking to her friends and not giving a flip about trying to help me is her priority then I'll buy my earrings someplace else.