Which of the Most Expensive Things in the World Would You Buy?

9. Wittelsbach-Graff diamond: $80 million

The Wittelsbach blue diamond was one of the largest in the world at over 35-carats. It originally came to Europe from India in the 17th-century, where it was worn by many royals and became part of the Austrian and Bavarian crown jewels. Diamond magnate Laurence Graff purchased the gem for $24.3 million at auction in 2008. He was criticized for recutting it, removing around 4-carats of weight, but he later sold the rechristened Wittelsbach-Graff diamond to the former emir of Qatar, Hamad bin Khalifa, for around $80 million.