The demand for 'healing crystals' around the world is soaring.

New York based Kiwi journalist Tess McClure got curious about healing crystals and the question of where they actually came from.

Her attempt to answer the question took her to tunnels deep in the earth of Madagascar.

McClure discovered many are mined in deadly conditions in Madagascar, one of the world’s poorest countries.

And there is little evidence that this billion-dollar industry is cleaning up its act.

Tess McClure joined Kerre McIvor to discuss her fascinating journey on finding the dark truth behind healing crystals.

LISTEN TO THE INTERVIEW ABOVE