5. The Sweet Josephine—$28.52 Million

Remember when you turned seven and for your birthday you received a Barbie doll, teddy bear, or some other age-appropriate gift? Well, Hong Kong billionaire Joseph Lau bought his daughter this 28,725,000 CHF (approx. $28.52 million USD at the time of auction) fancy vivid pink diamond for her seventh birthday. The sale set a record for most expensive vivid pink diamond sold at auction and even prompted a round of applause from the Christie’s sales room. Immediately after the sale, Lau renamed the stone Sweet Josephine in honor of his daughter.