The Rubyvale Boys help a neighbour who is in need for a cut of the sapphire spoils. Tom heads to the Tasmanian mountains in search of meteorite-impact glass.

In their desperate bid to set up a second sapphire mine, The Rubyvale Boys face a cascade of equipment failures, while Frankie and Ebriony trudge through dense grasslands on the hunt for peridot. The Neils risk their lives in the sweltering heat of an abandoned quartz mine to stave off mounting bills.