Thank you every one for your advice and suggestions. I will have them appraised and will post the results. It was a calculated risk on our part to order them from an unknown website but the site looked reasonably convincing, providing their factory and headoffice address, pictures of farming etc. Knowing that business of jewelry and art is associated with frequent fraud it would be good to get an appraisal. It is not about trust or mistrust, but a business transaction. Like counting money in the bank is not about mistrusting the bank. I have to say about the vendor that they returned promptly emails and phon calls, and delivery was free by FedEx. The pearls appear perfect, I was able to see only one very small pin prick and the luster is almost not real. If only pearls were real!