Can my stone go in water?
Not all stones tolerate water. Check before you dip yours.
Why water damages some stones
Water looks harmless, and it is for most quartzes. But a stone is not a pebble: it is an assembly of crystals, some porous, some soluble, some hydrated, meaning they already hold water in their structure and cope badly with gaining or losing any.
Three families cause trouble. Soft, soluble minerals first: selenite, a variety of gypsum, slowly dissolves and loses its satin sheen after a few baths. Copper carbonates next, malachite and azurite above all, whose polished surface dulls and whose dust should never be inhaled. Organic materials last: amber is fossil resin, coral and pearl are living calcareous structures, and all three react to soap as badly as to hot water.
A fourth case is less obvious: treated stones. Waxed lapis lazuli, stabilised turquoise and oiled emerald were given a substance in the workshop that fills their fissures. Warm water and detergent carry it away, and the stone then shows the flaws the treatment was hiding.
The three verdicts, and what they mean
Water is fine: cold rinse, soft toothbrush, dry with a cloth. That covers quartz, agate, jasper, sapphire, garnet, and most stones above 7 on the Mohs scale with no notable porosity.
Brief rinse only: a quick pass under cold running water, never a soak, never hot water, dried at once. Opal belongs here for a precise reason: it holds up to 10% water, and a shock of humidity or temperature can crack it from the inside, what lapidaries call crazing.
Never water: a soft dry cloth, nothing else. Selenite, halite, malachite, pyrite which rusts, amber, pearl, coral, unstabilised turquoise. For these, water is not a theoretical risk: it leaves a visible mark from the very first cleaning.
Cleaning without water, and storing properly
A dry microfibre cloth removes most of it. For dust lodged in a geode or a druse, a clean make-up brush does better than a jet of water. Mounted jewellery is cleaned with a jeweller's cloth, carefully avoiding the stone if it falls in the third category.
Storage matters as much as cleaning. A soft stone scratched by a hard one in the same box is the most common and most avoidable damage: diamond scratches everything, quartz scratches opal, and one fabric pouch per stone settles it for a few euros. Direct sunlight, meanwhile, fades amethyst, kunzite, topaz and most pink stones within months.
A word on cleansing. In crystal healing, water, salt and moonlight are presented as cleansing rituals. This page is not about that: it is about what the mineral physically tolerates. If you follow those practices, the question stays the same, and so does the answer: selenite left in salt water will dissolve, whatever the intention.