While everyone knows that diamonds are a girl’s best friend, natural colored diamonds are quickly becoming an intimate acquaintance of savvy investors, thanks in large part to their rarity (just one of every 10,000 diamonds earns the distinction of Fancy Colored Diamond). Accounting for a mere 0.03 percent of the world’s diamond production, Natural Pink Diamonds are in particularly short supply—90 percent of them come from Australia’s Argyle mine, expected to have less than ten years of production