More likely French but then one more guarantee mark is needed (for gold).
symboles un trèfle à quatre feuilles
Symbol: a four leaf clover
There was Charles Gavet who was the founder of family business and worked much earlier, see here:http://www.925-1000.com/Ffrench_makers_C.html
Can you post the image of the whole item (earrings ?).
I think there is CG in the logo, too.
Besides,there is sun symbol used by the founder in early 19th century.