Mikimoto 3 Pearl Brooch Pin Silver

Description

This delicate pin has been in my possession since the 1970's.  Beautiful pearls have a luscious creamy pink cast.  The markings inside are the M for Mikimoto's trademark and an "S" which is supposed to be for silver but I have never polished this pin in my life and it looks as good as the day I received it so I think it is plated with something else.  Some forums mention Rhodium or platinum, I don't know.   I don't have the box unfortunately, it come in a standard jewelry box for protection while traveling.