Billionaire Bling: From Jewels to Submarines

Robert Frank, author of "High Beta Rich," says the average size of a yacht today has more than doubled. The 560-foot "gigayacht" pictured above is owned by Russian billionaire Roman Abramovich. It's rumored to have cost a billion dollars. CLICK HERE for the the full story on "20/20" (SEBASTIEN NOGIER/AFP/Getty Images)