Iranian Crown Jewels, also known as Imperial Jewels of Persia, are one of the world's largest and most valuable collections of jewellery. While there's no officially declared amount, they're estimated to be worth between $20 billion-$50 billion. The collection is housed in Central Bank of Iran, which includes the 182-carat Darya-e Noor diamond, the Gem-studded Globe, and the Pahlavi crown.