Still, this is a good primer to get started. At one point I mention a singing bowl and can't remember the name of the dealer. It's Shanti Bowl. Because there are so few antique Himalayan bowls available, there are a lot of fakes. I have found a few dealers I believe to be reputable. Please contact me if you're looking for antique bowls and want the name of the few dealers I believe to be reputable. I'm sure I don't know every reputable dealer, but I do know of a few.
I also mention crystal singing bowls are silicon sand. More specifically, they are a silicon sand that is ground up quartz, heated and then molded. Most are 99.9+ percent quartz sand.
I almost always buy singing bowls by sound - so always try to get a good idea of the sound of a singing bowl and whether it is pleasing to you. If they are online, many dealers offer sound files. Make sure the sound files are for the exact bowl you are ordering, since sound frequency preference is such a personal thing. I did buy one bowl specifically because its energy attracted me (and I loved the sound), and that's the 18th century bowl I show with heavy patina.