The Great Valdez Sapphire

I know more about it than anyone else in the world, its present owner not excepted. I can give its whole history, from the Cingalese who found it, the Spanish adventurer who stole it, the cardinal who bought it, the Pope who graciously accepted it, the favored son of the Church who received it, the gay and giddy duchess who pawned it, down to the eminent prelate who now holds it in trust as a family heirloom.