Patrick and Kirsty revisit a 15-year-old ocean kyanite dig site. Kyle and Glenn must pivot from quartz to black agate to reach their huge dig target.

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. Kyle's relationship with his girlfriend, Jillian, is on the rocks as the pair futilely hunt for Killiecrankie diamonds.