Vintage Sterling Silver Theda Marcasite Flower Cultured Pearl Brooch or Pin

Item is in good used vintage condition Light to medium wear Pin back (mechanism) is in working order Marked on the back: Sterling Theda May need a cleaning polish if desired Real pearl See pictures for measurements and size Weight is approximately 16.2 grams Rare find from the 1980’s Note: This is a genuine pearl I do not know what type I do not have a receipt They have not been authenticated... and want be If you are looking for a specific type like Tahitian, Fresh water, Akoya, south seas, etc.. than please do not buy theses from me.. I am a honest seller! posh 1 & 2 ambassador... I list everything as accurate as I can... I go back over each item after it sells to insure I haven't missed a flaw.. if so I will notify you and let you decide,..if you still want the item or not.. Thank you, Shari