I does not look too old to me. But that's just my opinion. Also, I doubt there is much Egyptian stuff laying around in Florida but hey, I could be wrong. Let's see what others here have to say. Good luck.
I could see that as being Egyptian Revival from the mid 1920's into the early 30's. So not ancient, yet not really a reproduction of any exact ring, just an appreciation of the symbols, style, etc.
I agree with nhbenz, In the twenty's after the finding of King TuT's tomb Seemed like er'body went crazy for anything Egyptian. This led to an Egyptian revival And as stated above from the mid 20's into the 30's there was a lot of Jewelry in that style..........Cool find................HH