Professor David Phillips, Head of the School of Earth Sciences at the University of Melbourne, recently crushed an eight-carat diamond to extract two rare, emerald-coloured inclusions in an attempt to discover the secrets of its origin and a potential 'mother lode' of diamonds. The inclusions are made of a green mineral called clinopyroxene, which contains small amounts of radioactive potassium. This makes it possible to date when the diamonds erupted out of a volcano, after they were formed inside. Knowing this makes it easier to hunt down the original source. This pea-sized diamond was worth $7,000 uncut and was found in a South African riverbed by exploration company Namakwa Diamonds. Recently, Professor Phillips and a University of Melbourne team successfully dated clinopyroxene inclusions in diamonds from the Namibian coast, tracing them to volcanoes more than 700km away.