Where and in What era is this Antique Jewelry From?

by Lee
(Massachusetts)

This piece has been in the family for many years, it was purchased at an estate sale in the late 70's, however, the piece has never been evaluated. It was tested for 9 karat gold, the diamond chip is genuine, but do to the age of the piece, it is not gold stamped. The most information I recieved was that it was a watched dangler brooch. I have been trying for years to get information on this piece and its value. Can you please help