Cleansing a stone in water: when and how, depending on the stone

Two different ideas under one word

When people talk about “cleansing” a stone with water, two things get mixed together. The first is a physical cleaning: removing dust, skin oils, salt and cream residue. This cleaning is real and measurable. The second is a symbolic purification: in many cultures, water evokes renewal, as in ritual ablutions, baptism or Shinto purification. In the stone tradition, rinsing a stone under water “resets” it. It is a meaningful gesture, with no demonstrated physical effect on the stone itself.

This page first gives you the physical rules, which matter for not damaging your stones, and then the symbolic gesture.

Which stones tolerate water?

The basic rule: a hard stone (Mohs hardness of at least 6.5 to 7), dense and free of fractures, tolerates rinsing well. A soft, porous or soluble stone, or one stabilised with resin, does not.

Gypsum (selenite) is only slightly soluble, about two grams per liter at 20 °C, but enough for its surface to degrade and become rough after repeated soakings. As for the anhydrite in angelite, it absorbs water and turns into gypsum. For the detailed list, see stones that fear water.

The gentle method, step by step

1. Put the plug in the sink, or work in a bowl: a stone that drops down the drain is quickly lost.
2. Prepare lukewarm water (never hot: thermal shock can crack a fractured stone) with a drop of mild, unscented soap.
3. Scrub with a soft brush or a soft cloth, paying attention to the crevices.
4. Rinse with clear water for a few seconds.
5. Dry immediately with a soft cloth: water left to dry leaves limescale marks.
6. Let it finish drying in the air, in the shade.

For a stone jewel, do not soak the stone if it is glued to its setting: water can loosen the glue and tarnish the metal. Use a lightly damp cotton swab instead.

Common mistakes

• Soaking overnight: the duration adds nothing, but it damages porous, soluble or glued stones.
• Using vinegar, lemon or household products: acids attack carbonates (calcite, malachite, rhodochrosite, pearls, coral) and degrade treated surfaces.
• Using an ultrasonic cleaner: it can shatter fractured stones or those filled with resin, such as emerald or stabilised turquoise.
• Using hot or boiling water: risk of thermal shock for fluorite, opal and topaz.
• Drinking the water from a stone: see crystal elixirs.

Tap, spring, rain or sea water

In the tradition, running water from a stream or rain is prized. For a sturdy stone, clear water works perfectly well. But stream water may be polluted, rainwater collected from a roof may carry particles, and sea water, being salty, damages porous stones and metals: see purifying with salt: the risks. Tap water with a little mild soap is the simplest and safest solution.

Hardness benchmarks

The Mohs scale measures resistance to scratching, using ten reference minerals: from talc (1) to diamond (10), passing through gypsum (2), calcite (3), fluorite (4), apatite (5), orthoclase (6), quartz (7), topaz (8) and corundum (9). A few everyday objects serve as benchmarks: a fingernail (about 2.2), a copper coin (about 3), an ordinary steel blade (about 5.5, like window glass). This scale is ordinal, not linear, and hardness is not toughness: a hard crystal can still break under impact. A few stones, such as kyanite, even have a hardness that varies with direction.

The symbolic gesture, if you wish

If you enjoy ritual, you can accompany the rinse with an intention: hold the stone under a thin stream of lukewarm water, breathe, and think about what you wish to “let go.” One minute is enough. The water mainly removed the dust; the moment of calm is for you. For other approaches, see smoke, moonlight, salt and the purification table.

Choosing your tools

A glass or ceramic bowl, a soft-bristled brush (a soft toothbrush), a microfiber cloth, and mild, unscented liquid soap. For regular care, a dry or barely damp wipe is the safest. For special cases, see cleansing and recharging your stones and the Mohs scale.

Frequently asked questions

Also read

The meanings mentioned belong to tradition and symbolism. They are neither promises of results nor medical advice. Back to Care and safety for stones.