You can get them on ebay (where else?). The Herkimer diamonds are, as far as I can tell, clear quartz crystals, but mined in Herkimer NY. I use a plate of shungite with copper flat tape wrapped around it in four stripes around the plate, and I put one crystal on top. As Mahgister said, with just the shungite, there is more definition, easily heard, but a little dry sounding. The crystal takes care of that.
I happened to have the copper tape because I do stained glass, but you can get it anywhere stained glass supplies are sold, or online. It has adhesive on one side.
By the way, I don’t really thing that there is any real difference between Herkimer and regular clear quartz, and I am a gemologist, so you can probably get it cheaper than I did on ebay. It’s pretty common.
I happened to have the copper tape because I do stained glass, but you can get it anywhere stained glass supplies are sold, or online. It has adhesive on one side.
By the way, I don’t really thing that there is any real difference between Herkimer and regular clear quartz, and I am a gemologist, so you can probably get it cheaper than I did on ebay. It’s pretty common.