Flat Helm Of Awe Ravens Bronze Ring

the ring is good looking, the etching of the runes and ravens look good and the fit is great, it looks almost 1 to 1 as the picture on site that said the metal itself is a bit thinner then I expected from the photos but the downside as I see it is that after only 2-3 hours of wearing it, it left a ring of green oxide on my finger, as can be seen in the image... I hope this will not be a reoccurring problem as that is a major downside