I have this gorgeous druizy ring set in open bezel. The stone is semi transparent - and the bezel tarnished on the inside (the sides). Is there a way to clean it at home without taking it in?
Going only by your description, if it were my ring, I would carefully "tickle" the inside of the bezel with Tarn-X on a small, inexpensive paintbrush. Use very little! Then flush the ring right away with lots of water.
The Tarn-X won't harm the druzy, which is a hard stone, but only apply the Tarn-X to the tarnished area.
Let me also add that if your druzy is irridescent, then do not use this method. The irridescent coating may be compromised.