People who own loose gemstones almost always worry about theft. But the most common loss of value — the one no policy covers — is far more ordinary: the stones damage each other.

The problem isn’t the box, it’s the Mohs scale

Mineral hardness is measured on the Mohs scale, and it works in exactly one way: whatever sits higher scratches whatever sits lower. No exceptions.

10 — diamond
9 — corundum: ruby and sapphire
8 — topaz
7 — quartz, amethyst, citrine
6.5 — peridot, tanzanite
5.5-6.5 — opal
4 — fluorite
3 — calcite, pearl, amber

Two stones in the same parcel paper, a drawer that opens, a drive to a gem show: that movement is all it takes. A half-carat diamond rubbing against an amethyst for one afternoon leaves marks that don’t come out, and repolishing costs weight — which costs value.

Hence the only rule that matters: one stone, one compartment. Not one large handsome box, but many separate seats.

Velvet compartments, and why velvet

Velvet isn’t there to look expensive. It works because it is a short-pile fabric that holds no hard fibres and no abrasive residue, doesn’t trap silica dust the way raw cotton does, and keeps the stone in place when the case is moved or tilted.

A fifty-space case with shaped seats solves the problem at the root: every gem has its own place, the whole collection stays visible at once, and nothing touches anything else.

Acrylic capsules: when they actually earn their place

A clear acrylic capsule makes sense in three specific cases:

certified stones, where the certificate number must stay tied to the gem;
stones you need to show without letting people handle them, at a show or in front of a client;
high-value stones that move often.

For a collection that stays home, capsules are an added cost: velvet seats are enough.

Light, heat and humidity: the stones that don’t forgive

Amethyst, kunzite and some topaz fade under prolonged sunlight. Not in a day — but a south-facing cabinet over one summer shows it.
Opal holds water within its structure. Temperature swings and very dry air can cause crazing, a network of micro-fractures, and that damage is permanent.
Pearl, amber and coral are organic: they suffer from perfume, cosmetics, acids and airtight containers. They want air.
Emeralds are nearly always oiled or resin-treated to soften inclusions; heat, ultrasonic cleaners and solvents can strip the treatment and change how the stone looks.

A closed wooden case, kept away from radiators and direct light, covers most of these risks on its own.

Transport is the dangerous part

Gems get scratched in motion, not at rest. Anyone carrying stones to a show, to an appraiser or to a valuation needs a gemstone travel case that actually locks or clips shut, with seats deep enough to hold the stones even if the case is turned upside down.

A cloth pouch with ten stones in it is the fastest way to arrive with ten marked stones.

Catalogue as you put them away, not afterwards

A numbered map of the compartments — seat 1, seat 2 — with a sheet or a file recording weight, cut, origin and certificate for each number turns a box of stones into a documented collection. It is also the only thing that genuinely helps at appraisal, insurance or resale.

How to choose a case

Number of spaces: err on the generous side. Collections grow, and putting two stones in one seat undoes the whole point.
Seat depth: it must hold the stone, not merely rest it.
Material: wood is stable against humidity and doesn’t warp; covered cardboard fails at the hinge after a few dozen openings.
Closure: if the case travels, it has to close properly.
Velvet colour: light velvet lifts dark stones, black lifts pale ones. If you photograph your gems, this matters more than it sounds.

Our catalogue has loose gemstone storage cases built exactly this way — fifty seats, wood and velvet, with acrylic capsules available: see all gemstone cases and boxes.