Quartz crystal is possibly the best thing, but clean high-quality sand, water, oils, other gemstones, silver, copper, and gold are also good. Lots of people like hologram stickers too. It depends on what you are doing and how you want/need to use it.
For more details, please check the link:
https://www.spooky2.com/forums/viewtopic.phpf=28&t=14868&sid=86ce08e13355b281c4daad3d8670402d
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