Beside his passion for diamonds, Graff has become one of the world’s leading art collectors, focusing on 20th-century masters, including Picasso, Calder, Fontana, Lichtenstein, and is on the board of several major museums. 
He will continue to chase a precious rarity, scouring the world for the best gems “he spend 24 hours a day, seven days a week”. Before I leave the Gstaad chalet, Graff shows me around his stellar art collection, explaining that in this, as in gemology and business, he is a self-taught, repeatedly refining his knowledge.
KING OF DIAMONDS 
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