The Argyle Diamond Mine - located in the remote East Kimberley region of Western Australia - was producing more than a third of the world’s diamonds by volume. The majority of these diamonds were small and brown-toned, but Argyle’s global reputation was built on its rare pink diamonds; so when they began surfacing in places they were never meant to be, it became Richard Corfield’s responsibility to sleuth the truth. But ow many diamonds will be stolen in the meantime?