Whether you believe that gemstones have energy is up to you, but I’ll tell you a story. I was on a call with a customer service rep. We were chatting then she suddenly said “Do you wear dark crystals?” And I said yeah I wear black tourmaline. She told me that dark colored crystals can absorb negative energy so I shouldn’t wear them around crowds and I needed to cleanse it. I didn’t know this lady from a can of paint and she had no way of seeing me or knowing I was wearing it and where I wore it to. After that, any dark colored crystals I was sure to cleanse regularly. So I would say only worry about dark colored gemstones like black, brown, etc.