Here are bags of Black Tourmaline crystals are from China. They are a good size for gridding. Let them do wonders to clean your energy field after a bad day. And keep it on your desk at work to clean up the energy of others around you who are in a bad place. Black tourmaline also helps you learn life lessons so you can be stronger within yourself and this deflect negativity coming at you.
I do not know where in China they are from, but they are completely natural and a nice strong crystal like Australian ones. You can carry in pockets unlike the Brazilian rulers.
Select either 4 crystals in bag with a total bag weight about 34 g, 47 g or 58 g. The example of 4 crystal bag of 58 g are in photos 1 and 2. And 34 g in photo 3.
Dimensions are for the bag.
Most people buy a bag of black tourmaline crystals for grids.