Moldavite
I have mine wrapped in copper wire. I have been wearing my moldavite for longer than I can remember in copper wire. It seems just fine. I also have a moldavite ring I got yesterday and it is in silver. It seems the same as the ones around my neck that are in copper. It is my humble opinion that copper works just fine with no problems at all.
I have had some very WOW experiences with Moldavite. I have done a lot of research on Moldavite and have found my own experiences to be different than what others have had. I don't get "yanked around" by it and it never changes my life against my will. Instead, it has EMPOWERED me to the understanding of how the universe works and what my part in it is. I have learned that what you think about, you will get. Don't think a lot of "I don't want this" thoughts. Instead, think positive and healing thoughts. Moldavite showed me this. Moldavite helps me to be spiritually sensative in a way that shows me how to get what I want and KEEP what I want also. Nothing about Moldavite "forces" me to do anything against my will. It just shows me what I'm in for with the thoughts and actions I have and do and it has helped me to realize that if I dare to dream for anything, I WILL get it. And it has shown me to not worry about things, for if we worry about anything cronically, that will come true too. But to put your worries to rest, positive thoughts are hundreds of times more powerful than negative thoughts. So don't go nuts trying to control your thoughts. If you think of hundreds of negative thoughts and a handful of positive thoughts, those positive thoughts will be what you get. And the more positive thoughts you think, the better your now experiences are also.
THINK POSITIVE! If you do, you will get what you dream of and more! Moldavite showed me that and I am empowered because of it. It has been more of a light in the dark, rather than a chain that yanks me around. I was blind before Moldavite and with this most precious stone, I now see. I will never sell them for any price. They are worth all the money in the world to me.