I thought hallmark jewelry means a logo by the manufacturer. I did not know that the same logos are used for one country by an office after testing an...

Any information about the buyer of this antique natural pearl and diamond necklace ?

Thanks, for the information and comparison provided.

However, the price of £20,000 (US$ 31,500) does not come anywhere near prices realized by similar drop earrings incorporating nacreous pearls.