Outback Crystal Hunters, Heart of (Darwin) Glass

Patrick Gundersen's team tackles harsh terrain in the hunt for aquamarine. Jarrin and Hugh dig for rare and fragile crocoite in an ancient mine. New team, The Rubyvale Boys, battle against mechanical malfunctions in their pursuit of precious sapphire.

Newcomer, Neil Wilkinson Jnr., abseils down a deadly mineshaft in search of cubic fluorite, while Jarrin, and Hugh take the plunge into frigid waters, sieving and sniping for Tasmanian sapphire.

The Rubyvale Boys help a neighbour in need for a cut of the sapphire spoils. Tom heads to the Tasmanian mountains in search of meteorite-impact glass. Patrick Gundersen battles steep slopes and dense bush to reach old timers' aquamarine diggings.

Desperate to hit their monster season target, Patrick and Kirsty revisit a 15-year-old ocean kyanite dig site. Kyle and Glenn must bring in reinforcements, and pivot from quartz to black agate for any hope of reaching their massive dig target.

In their desperate bid to set up a second sapphire mine, The Rubyvale Boys face a cascade of equipment failures. Plus, The Neils risk their lives in the sweltering heat of an abandoned quartz mine to stave off mounting bills.

Patrick Gundersen’s delicate operation to extract Australia’s largest smoky quartz cluster is derailed by hard ground, while Jarrin and Hugh’s stichtite dig forces them to resort to more explosive measures.

After a near-catastrophic cave-in at Shane Dohnt's crocoite mine, Kyle Archer, and his team must work an abandoned drive reclaimed by rainforest, while Frankie and Ebriony's grassland garnet expedition is cut short by bushfires.

Amidst season-ending rain, Jarrin and Hugh hunt for anything, and everything in the walls of their tired mine. Desperate for cash, The Neils return to 'Topaz Mountain', risking life, and limb against deadly boulders.