The beads are tourmaline, and the pendant I picked up at Kohl's (of all places). It's cast pewter or aluminum. I'd see if you can still find them, it's only been a couple weeks. There are two in the original piece, strung on brown suede.

Here's the original post on the jewelry blog:
http://fallingleafarts.blogspot.com/2008/03/when-brigid-sang-to-trees.html