The stone I'm about to discuss, naturally loopeholes the wiccan rede. The stone is Tourmalated Quartz. Tourmalated Quartz, is clear quartz with inclusions of Black Tourmaline within. It is an awesome stone to carry around. It naturally returns negativity to it's source without having to pre-programmed to do so. Regardless of the owners way of thinking. No kidding. It is great to use on a staff or wand. It also is great for past life regressions, and astral travel. Have fun with this one.....
I found a particularly good example of this stone set in a ring. I had to buy it but was a bit hesitant to wear it because what would happen if I pointed at someone ya know? I started wearing it on my ring finger so I wouldn't point it at anything on accident. Because it was cabochon the stone has come out. I am toying with the idea of having the stone reset as a pendant. That way it would act more like a shield in my opinion.
I have a piece of this myself; a loose, medium, tumbled stone. It also rivals selenite in its ability to aid or induce meditation or journeying. Another quality of it I really like is its durability - it doesn't dissolve in water and is colorfast in light, so I frequently let mine rest and recharge in the sun after I've used it.