Vintage Diamond & Ruby Ring

Hello I’ve just rediscovered this lovely Ring and just managed to clean the little makers mark which looks like LY to me. Couldn’t get a clear pic of it, I then noticed all the verdigris on the back of the stones which made me wonder how old this actually is. And didn’t see the mark because it was full of dirt. Could be real stones I guess because it looks and feels quality. I’ve taken this to be checked and it’s Diamond and Ruby’s, and Real