Which product holds the Guinness World Record for the most expensive single item ever sold at retail (not at auction)?

World records fascinate us all, especially when they involve jaw-dropping prices. The retail world has its own set of incredible records that showcase the extreme upper limits of pricing strategies. This trivia question explores the intersection of world records and premium pricing strategies that have made retail history. Can you identify which product holds the record for the highest price ever paid in a retail transaction?

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The L'Incomparable Diamond Necklace ($55 million)
The History Supreme Yacht ($4.8 billion)
The Graff Pink Diamond ($46 million)
The Cullinan Dream Blue Diamond ($25.3 million)