Nature Designs - Not all crystals and stones are water safe. Depending on the crystal, water can cause the crystals to dissolve, break, oxidize and even become toxic. Here is a reference
Can Amethyst Go In Water? What You Need To Know...
Can Amethyst go in water and salt water? Honest Answer
Can Amethyst Go in Water? 3 Astonishing Ways! - The Crystal Apothecary Co