(Richmond, VA, USA)
I purchased a nice brass pendulum and after I had cleansed it and I asked it if it would ever lie to me and it responded with "YES". Needless to say, I got rid of it.
I have had success using a pendant made from a Mexican fire agate that is on a gold chain. I wear it every day so it has my energy in it.
So does it really matter what a pendulum is made from?