Nice Find! Here is an idea if you want to know for sure if it is gold take it to a jeweler or pawn shop and say you want to cash in your "GOLD" ring, believe me you, they will test it and let you know!!!! LOL
Also I have been told is that gold compared to other metals is that gold is colder, supposedly It doesn't warm up as quick as brass or other non precious metals. (that is what I am told, but I have never been able to tell the difference), but if you have a brass ring you can compare the two. I know this isn't conclusive, but maybe it will help.
Now this idea is way out there and I know it sounds REALLY crazy but I know it works and it is a trick I use when I go to rummage sales. If you have access to women's make up specifically the powder they put on their face after they put all the other crap on. It comes in compacts and or bigger containers. Rub the powder on your arm or hand then take a ring that you know for sure is gold and rub it up and down on the powder you applied, if it is gold or silver it will leave a black mark. If it is not it may leave a trace line from where you rubbed but you will see how much darker the precious metal mark is. Then when I get home I test it with my gold tester or do the acid test. I would say 95% of the time it is right on. The 5% that isn't is usually the plated jewelry. I hope something I said helps a little!