Jewellery designer, Rajvi Vora discovers more about precious gold as she looks ahead to the future of gold. With cryptocurrency snapping at its heels, can it remain a financial powerhouse? Ravi unearths what goldmines are doing to our planet and to the people who work at them, including the Indonesian families being poisoned by the goldmines on their back doorsteps. But there is a good side to gold too. She hears from the scientists beginning to tap into the potential of using nanogold to treat cancer.