Top 5 Most Expensive Pearls in the World Beauty of Ocean Pearl [$139 Million] the biggest and most expensive pearl in the world is called “Beauty of Ocean” Pearl. It took three years for this pearl to be ground into this surprising shape. Composed of fluorite, the green pearl has the potentials to glow in the dark. this pearls weighs six tonnes and is five feet high. It was found in Mongolia, China and worth aroud $139 million.