Concave surfaces inside a shank form collection points that trap moisture and contaminants, also causing a type of dermatitis. Remove all rings before using soaps, cleaning compounds or detergents, and clean rings frequently. You will be amazed at how well your jewels sparkle. If these tips still don't solve your problem you may want to switch to 18kt or platinum. It Ain't Easy Being Green.
Emeralds pay a high price for their distinctive green hue.
Chemical analysis shows it to be composed almost completely of beryllium and aluminum with traces of color causing chromium and iron. The problem is chromium isn't native to the gem. It gets there through a series of disruptive chemical substitutions that wreak havoc on its crystal structure. That is why most emeralds have a trade off between color and clarity. Accommodation of the color imbuing chromium atoms usually leaves the stones with complexion problems.