Nice cameos. I think the one one the right is Bakelite, circa 1930-1940, Victorian Revival. I'm guessing in the vicinity of President Grant on the value side.
I'd like to see a closer vies of the one on the left, which I suspect is glass...
The problem with cameo's is it could have been made recently and made to look old or be a reproduction of an old style so they are hard to date without makers mark.
Pretty sure Surf is right on the bakelite 1930-1940... The 2nd one is interesting.. I am not a huge expert on Victorian Cameos but I will say that I have collected these before and these Cameos are something you pay close attention too @ yard sales and flea markets because lot of Victorian Cameos are made out of white gold like the two in the photo. I've found about a handful of Cameos before that the person selling it had no idea it was a Victorian white gold cameo which can sell for most in good condition $250-$2,000 and some cameos even had a diamond like the one in the photo. The one you have looks like it could date into the Victorian period maybe the later Victorian Period?? or even into the 1910-20s and I don't know if it is a white gold one or not but I will say these can be a pretty good score! so be on the look out for these!