Here are a list of Crystals that are safe and unsafe for water. This list is based off of items in our shop.
Water Safe Crystals:
Carnelian (though NOT safe in salt water)
Black Obsidian (FYI: can break in EXTREME cold or hot water temperatures)
Some say add salt into water, however salt can be corrosive to most unpolished gems. If using salt be sure to use pink Himalayan salt!
Water Unsafe Crystals
Fluorite (especially SALT water)
Many of the crystals on the unsafe list will completely dissolve when place in water, or they will lose their shine. Now don't get me wrong you can quick rinse, but do not soak these crystals in water at all.