Victorian 9 ct gold, silver and base metal stickpin

I found this stickpin a while ago, cant even remember where exactly, but I must have paid about 0,5€ for it. Its a bit of a mystery to me. It looks like it was fixed one time, but it wasn t done very good. If you look at its back it looks a mess, and you can even see the messy back in the front.
Must have been an earring or something else they changed into this stick pin. Its Victorian with some rose gold detail in black enamel. It depicts eternity with its two overlapping circles.
In the last picture I show you some other stickpins I posted earlier here on CW. They are all silver, except of the FIX Jeanne d'Arc, the gold and seedpearl horseshoe and the gold and enamel Blackamoor.
I hope you like it. If you have any additional info on my latest stickpin, please enlighten me ;-)