The Yowah nut is found almost nowhere else on Earth. It forms as a small concretion within the ironstone, an ellipsoidal lump usually an inch or three across, and the opal grows as a kernel sealed inside. The first claim here, the Southern Cross Mine, was registered in 1884, and a hard-scrabble field grew up around it. The work has stayed small and stubbornly hands-on ever since. There are no giant industrial pits here, just independent miners, family claims, and the patient art of knowing where to dig. You can buy the results straight from the people who pulled them out of the ground, in any state you like: rough nuts still wrapped in their ironstone, polished stones, or finished jewellery. You can also pay a small fee to have a nut of your own cut. Whether it holds anything is anyone's guess until the saw goes through.

About 126 people live in Yowah, give or take whoever is in residence on their claim that season. There is no pub. There is no bottle shop. The nearest cold beer waits in Eulo down the road, or 135 kilometres north at Toompine, a settlement whose population is two: the publican and his wife. On a holiday weekend, a good slice of Yowah simply drives to Eulo for a drink and drives home. A single caravan park with six cabins handles visitors. Telstra reaches the town and no other network does, so there is still a public phone bolted to the landscape for everyone else. Once a year, on the third weekend of July, the whole calculus changes. The Yowah Opal Festival fills the local hall with museum-grade stones, and miners and collectors from around the world descend on this dot in the mulga to buy and trade the gems the place is famous for.

Yowah sits at the end of 60 kilometres of sealed road that branches off the Bulloo Developmental Road, signposted hopefully as the Adventure Way, just outside Eulo. There is also a 23-kilometre unsealed four-wheel-drive track that takes about as long but can shave time if you are bound for Thargomindah. Once you arrive you will want a car simply to move between the claims and the bluff at the edge of town, where a lookout gives a view that locals only half-jokingly call the end of the world: flat red country running clean to the horizon under an enormous sky. Directions out of Yowah include one of outback Australia's better landmarks. To leave by the Black Gate Road, you turn left off the main road just past town, next to the dummy fireman, a roadside figure that has become the kind of navigational waypoint only a tiny place could invent.

Opal towns are built on a particular kind of optimism. Every nut on the ground might be the one, and that maybe is enough to keep people out here in heat and isolation that would empty most places. Yowah has weathered the boom-and-bust rhythm of the gem trade for well over a century without ever quite growing up into a city, and that is precisely its charm. The reward is not just the stone. It is the silence at night so complete you can hear the dirt tick as it cools, the stars uninterrupted by a single competing light, and the strange intimacy of a town where everyone knows which claim is yours. The opal is the reason people came. The country is the reason a few of them never leave.