What you said about a few hundred yuan of gold inlaid jade may be true, but the jade must be B goods, that is, it is artificially processed, and the color and fineness cannot be pure natural. If there are not many gold parts, grams and certificates, they should not be fake. You can ask them to make an invoice. If it is false, you can come back and settle accounts with them and claim something.
My little experience is for reference only.