“It is no secret that the art market has become drunk with money lately, with major auctions routinely raising record prices for artists old and new. Never before have contemporary artists, from London to Leipzig, New York to Shanghai, been at the center of such speculative fever. But $100 million for a diamond skull that cost $23.6 million (£12 million) to make? Even Russian oligarchs and hedge-fund billionaires might think twice. The work, by the way, is called ‘For the Love of God.’ Indeed.”