Luxury knobs have been done before, but not like Bentley. The new diamond-studded - 18k white gold knob should be flying off Bentley's shelves. It's been priced at a mere $150,000.00 - almost as much as the Bentley itself.
*FYI - For that kind of money, I would hope my new diamond studded knob is portable and battery-operated if you catch my drift! Oh, come on, you were thinking it too!