Looks very classic and deco to me, I like it. I would get sapphires or rubies. Are they genuine -- I'm sure they are but there are so many synthentics being sold lately! I wouldn't care about heat treatment - other treatments I'm not crazy about though. If they are only heat treated that is pretty standard. I wouldn't say any jewelry is an investment - unless you're buying at auction or maybe certain vintage pieces so buy what you love and I agree emeralds are too fragile - - I have a lovely ring with a not-so-lovely chip!