Often a green finger is a huge alert to a poor quality of ring it is one of the first indicators that people will notice. However if you did buy a "fashion jewelry" (think Clair's or Hot Topic) type ring and not a gold or silver or even stainless steel ring then the metal alloy base of the ring could be with causing your problem. People with sensitivities to nickel or copper tend to have this problem more then those who don't . Anytime you find a ring that says gold filled or S 80 or something a kin to those terms it is most likely not a quality product and will cause you problems. How much did you spend on the item you purchased? Did you buy it from a direct blue Nile store or their website? Lastly, on the inside of the ring is it stamped with 925 SS or a carrot amount like 10k, 18k, 24k, indicating that the purity of the ring is quality? if your answer is over $100 and yes to the last two questions, then likely the occurrence is due to an allergy you are having to the metal band.