World's costliest diamond

The diamond Joseph Lau bought is the most costliest in this world so far. The vivid blue colored diamond is called as "Blue Moon" and it weighs a hefty 12.04 carats. The previous record was hold by one of the Chinese buyer who has bought a pink diamond for 46.2 million, Mr. Lau has broke the record with his purchase. The auction went on a very tough note that buyers competed with each other for getting the diamond. The auctioneers said "It was a tough fight but finally Lau has won the bid".