There is a bracelet in the British Museum that was made for an Egyptian queen around 3000 BC. It is gold, and it is set with turquoise, and it was buried with her.
That is not the beginning of the story. It is somewhere in the middle of it.
The oldest stone anyone bothered to dig for
Turquoise is one of the first gemstones humans mined on purpose. Not picked up off the ground — mined, with tools, at cost, because someone decided it was worth the trouble.
The Egyptians were working the Sinai peninsula for it by 3000 BC, in mines so far out into the desert that supplying the workers was harder than the digging. They called the region Mafkat — the country of turquoise. The goddess Hathor was given the title Mistress of Turquoise. You do not name a goddess after a rock you found convenient.
At roughly the same time, and with no contact whatsoever, people in Persia were doing the same thing at Nishapur. Those mines are still producing today, four and a half thousand years later. The Persian word firuzeh means victorious.
And across an ocean, with no contact with either, the Ancestral Puebloans of the American Southwest were mining turquoise at Cerrillos in New Mexico and trading it a thousand miles south into Mesoamerica. The Aztecs made mosaic masks of it. The Navajo and Zuni have been setting it in silver for so long that the combination reads as a single object to most people now.
Three civilisations, three continents, no communication. All of them dug for the same blue rock, and all of them arrived at roughly the same idea about what it was for.
What it was for
Safe passage.
Turquoise is the travellers' stone, and it is the one thing every culture that found it agreed on. Persian horsemen set it in their bridles. Ottoman riders did the same. In parts of the Middle East it was fixed to the harness so that if the animal fell, the stone would take the fall rather than the rider.
Tibetan traders carried it along routes that killed people regularly. In Navajo tradition it was thrown into rivers as an offering for rain, and worn as protection by anyone going anywhere.
There is a European superstition, recorded in the seventeenth century and repeated for two hundred years afterwards, that a turquoise would change colour when its wearer was in danger — and that it should be given rather than bought, because it only worked when it had been freely handed over.
The colour-changing part has an explanation, and we will come to it. But hold onto the other half of that superstition, because it is the more interesting one: it has to be given.
What it actually is
Hydrated copper aluminium phosphate. The blue comes from copper; the green from iron replacing some of the aluminium. That is the whole difference between a sky-blue Persian stone and a deep green American one — how much iron happened to be present when it formed.
The dark veining, which people either love or try to avoid, is called matrix. It is the host rock the turquoise grew inside, still attached. Spiderweb matrix — fine, even, dark lines across the whole stone — is rarer than a clean stone and priced accordingly, which surprises people who assume clean means better.
Turquoise is porous and comparatively soft, around 5 to 6 on the Mohs scale. Glass is 5.5. This matters more than any other fact about it, and we will come back to it twice.
Why old turquoise turns green
Because it is porous, turquoise absorbs. Oil from skin, soap, perfume, hand cream, sweat — all of it goes into the stone rather than sitting on it, and over years it shifts the colour towards green.
So the seventeenth-century superstition was not entirely superstition. Turquoise genuinely does change colour on the person wearing it. It just responds to skin chemistry and hand cream rather than to danger.
Whether that makes the old belief less interesting or more is a matter of taste. We think a stone that visibly records the years it spent on one particular person is doing something better than a stone that stays identical forever.
Stabilised, and why it is not a dirty word
Most turquoise sold today — by some estimates the large majority of it — has been stabilised: infused with a clear resin under pressure to harden it and seal the pores.
This is standard, accepted, and generally a good thing. Untreated turquoise of a hardness that will survive being worn is genuinely rare and priced like it. Stabilised turquoise is still natural turquoise; it has simply been made durable enough to live on a wrist.
What is not acceptable is selling reconstituted turquoise — dust and chips glued into a block — or dyed howlite, or plastic, as the real thing. Howlite is a white stone with grey veining that takes blue dye beautifully and is sold as turquoise constantly, at every price point.
A quick test: if a strand of "turquoise" beads is very cheap, perfectly uniform in colour, and every bead matches, it is almost certainly dyed howlite. Real turquoise varies, because it formed in the ground rather than in a vat.
We disclose treatment on every product page. If a stone has been stabilised it says so.
Looking after it
Everything below follows from one fact: it is porous and it is soft.
- No water. Not showers, not swimming, not washing up. Chlorine and salt water are worse than plain water, and plain water is bad enough.
- Jewellery last. Perfume, hairspray, hand cream and sunscreen all soak in. Put it on after all of that, and take it off first.
- Dry cloth only. No ultrasonic cleaner, no jewellery dip, no toothpaste. Ultrasonic cleaners will destroy turquoise — this is not a cautious warning, it is a description of what happens.
- Out of the sun. Prolonged direct sunlight fades it, and the fading does not reverse.
- Store it separately. At 5–6 on the Mohs scale, almost everything else in a jewellery box is harder than it is and will scratch it.
Who it goes to
At Asi, turquoise is coded to Protection — which, given six thousand years of unanimous agreement across three continents, is not a decision we felt we had much say in.
Protection here does not mean a force field. It means the older, plainer idea the travellers meant: a closed door. The thing you take with you when you are going somewhere and you would like to come back.
And if the seventeenth century was right that it works best when given — that is worth knowing before you decide who yours is for.
We describe what stones have traditionally been carried for, and by whom. That is history and folklore, and it is offered as such. We make no medical, therapeutic or health claims about any piece we sell.