Which product holds the Guinness World Record for 'Most Expensive Limited Edition Consumer Product Design' ever sold at retail?

Product design plays a crucial role in setting world records. Some products are specifically engineered to break records, while others accidentally make history through their innovative design approaches. This poll tests your knowledge about famous product designs that have earned their place in the record books. Do you know which products have pushed the boundaries of design to achieve world record status?

This is a live public trivia poll on AIPolls.Net. Vote and see real-time results.

The Bugatti La Voiture Noire automobile (approximately $18.7 million)
Stuart Hughes' iPhone 4 Diamond Rose Edition ($8 million)
The Graff Hallucination diamond watch ($55 million)
L'Incomparable Diamond Necklace ($55 million)