Gemstones stored together scratch each other. That single fact accounts for more damage to jewellery than all the wear it receives, because a drawer full of pieces is a drawer full of diamonds (hardness 10) and sapphires (9) rubbing against opals (6), pearls (3) and everything in between. Storage is where the softer stones lose.
The hardness problem
A stone scratches anything softer than itself. In a shared box, diamond scratches everything; sapphire and ruby scratch everything but diamond; quartz (7) scratches opal, turquoise, moonstone, pearl, coral, amber and all metals. The scratches are fine at first and accumulate into a dull, hazed surface. Mohs hardness and the scratch test.
The rule: every piece in its own compartment, pouch or wrap. Never loose together.
Light
Some gems fade in prolonged strong light. Kunzite, some topaz, some amethyst, rose quartz, some yellow sapphire and certain treated stones lose colour in direct sunlight over months; amber and jet craze and darken. Pearls yellow. Store in the dark; display cases in sunlight are for pieces that can take it.
Heat and cold
Heat dries pearls, opals and Rudraksha and can craze amber; rapid temperature change cracks opal and can disturb fillings in treated stones. Room temperature, away from radiators, windows and lofts.
Humidity
Too dry cracks opal and pearl; too damp invites mould in Rudraksha and corrodes metal settings. Moderate humidity is the aim. In the monsoon, a sachet of silica gel in the box; in dry heat, avoid sealed containers for pearls and opals.
Chemicals
Storage boxes and pouches should be free of solvents, adhesives that off-gas, and rubber (which tarnishes silver and can affect some stones). Never store gems with cosmetics, perfume or cleaning products. Camphor and mothballs, sometimes placed in jewellery boxes, attack some materials.
What to store each kind in
Hard mineral gems (diamond, corundum, spinel, garnet, quartz). Individual compartments or soft pouches; the concern is protecting other pieces from them.
Softer and brittle stones (emerald, opal, tanzanite, peridot, moonstone). Individual soft pouches; protected from knocks.
Treated stones (glass-filled ruby, oiled emerald, stabilised turquoise). As above, plus away from heat and chemicals that could affect the filler.
Organics (pearl, coral, amber, jet, shell). Soft cloth or chamois; not airtight; away from everything harder. Organic gems are soft.
Rudraksha. Cloth pouch or wooden box, dry, ventilated. Cleaning and maintaining a Rudraksha mala.
Selenite and other very soft crystals. Wrapped, dry, alone. Selenite and satin spar.
Safes and security
A home safe protects against theft and fire; ensure it is not airtight for organics, and that fire-rated safes (which can hold moisture) are used with desiccant. Documents — the laboratory report, invoice, appraisal — are best kept separately from the articles, so that a theft does not take both. Documentation and insurance.
A periodic check
Every few months, take pieces out, inspect for loose stones, worn prongs, fraying thread and any change in appearance, and wipe with a soft cloth. Damage caught early is cheaper to fix.
Frequently asked questions
Can I store all my rings in one ring roll?
Only if the stones do not touch. Ring rolls that hold rings in slots without contact are fine; a pile of rings in a dish is not.
Is a velvet-lined box enough?
The lining protects against the box; it does not protect pieces from each other. Compartments do that.
Do stones need to "breathe"?
Pearls and opals suffer in airtight, dry conditions. Other gems do not care, but organics and Rudraksha should not be sealed.
Should I store gems in the original packaging?
If it separates and protects them, yes. Presentation boxes with a single loose compartment for several pieces are for presentation, not storage.
What is the single most important storage rule?
Every piece separated from every other. It costs nothing and prevents most damage.