Tech Tent 41: Money and Diamonds

Apple, Google, and other companies want us to use our phones to pay for goods. But do shoppers actually need, or want, the technology? In the week that Apple launched its Apple Pay service in the US, we speak to leading venture capitalist Saul Klein, who is backing several crypto-currency and digital wallet startups.

You might be forgiven for thinking that diamonds are for fine jewellery or cutting tools, but we hear from Ambika Bumb, founder of Bikanta Corporation how they could soon be used to help spot cancer earlier, and how she thinks recent investment in her firm by the incubator Y-Combinator signals growing interest in biotech in Silicon Valley.

And, we hear from the creator of a robot whose aim is to let you look out over the surface of the moon.

Presented by Rory Cellan-Jones, with Jane Wakefield from the BBC online technology desk.