How Can I tell How Old My Cameo Is?

Ok, I have been hunting for days to find a cameo like mine, but I cannot. It seems very unique and looks like an antique cameo.

The actual cameo part is very small and looks to me like mother of pearl, but maybe a shell of some sort. The carving is beautiful, but simple in comparison to the fancy lines I see on all the rest.

The pin part seems to be very old silver with a filigree look but made out of rolled metal, if you know what I mean. So there is a scroll look to the design. Around the edging is a small rope design, and in one spot you can see the where it's been soldered.

The pin is long from side to side with the cameo set in the middle. The pin on the back is not the modern lobster kind of clasp. I don't know if this description makes any sense, but I would love to know something about it. It seems very old. Thank you so much! I don't have a picture right now.