you bless your cystal and charge it ,and this is what I did to mine to cleans it. I put it in a bag and put sage for cleansing and salt and some herbs that has some thing to do with divination. like mugwort bing phychic things. I put in under the full moon. then I put it on a thread.
Thank you for the information, Diana. I have found (from personal experience) that pendulums made from something that has been inherited from an ancestor makes an exceptionally powerful pendulum. My great-grandmother left an emerald ring to me when she passed and I put that on one of my spare necklace chains. It works very well for me.