When Marilyn Monroe purred Talk to me, Harry Winston. Tell me all about it, during her star-making turn as showgirl Lorelei Lee in Gentlemen Prefer Blondes, the iconic moment informed the world that diamonds are a girl’s best friend, and cemented Harry Winston’s reputation as the place to find the most desirable ones. But even before Monroe’s cinematic endorsement, Winston was an established presence in the jewelry stratosphere, with ultra knowledgeable—and loyal—clients like the Duchess of Windsor, as well as a personal collection of extraordinary diamonds, rubies, emeralds, and sapphires (including the Hope Diamond, which Winston later donated to the Smithsonian). The pieces, called the “Court of Jewels,” toured the country as part of his passionate pursuit to show the beauty of gems to the world, well beyond the exclusive…