Vintage Pendant

Hello I’ve just rediscovered this lovely Pendant, it hasn’t got any markings but looks lovely, I might make a present out of this as I’ve seen loads of women on Tv wearing these kind of pendants nowadays. The cut of this stone is what I’ve seen described as antique I think. And I’ve read up on the gold foiledback stones, looks like it might have verdigris on it as well. No ideal how old or what the stone is but doesn’t seem to fog up. Looks like silver but not sure either