Australian police said Friday they had arrested and X-rayed a man over the theft of a pink diamond worth more than Aus$200,000 (US$180,000), with fears he had swallowed the rare jewel. The 29-year-old, reported by Australian media to be British tourist Matthew Osborne, was arrested as he attempted to board an international flight in Melbourne. "He is expected to appear in the Cairns Magistrates …