Diamond Engagement Rings along with beautiful, unique and antique gem stones of different colors blue, green, yellow, red building its beauty elegant and pleasing to eyes. The most expensive ring in the world is the Chopard Blue Diamond Ring, priced at $16.26 million. The Chopard Blue Diamond Ring has one that weighs in at nine carats that can make any girl go gaga over it!! The ring features an enormous, oval-shaped blue diamond, with diamond shoulders and an 18k white gold band paved with diamonds. This ring can make any other ring look insufficient and ordinary or rather should I say you have a safe bet with this ring to charm and win over the girl you love. Chopard Blue Diamond Ring. This stone set a record for the most expensive piece of carat sold at auction, coming in at $16.26 million. The stone comes in at $1.7 million per carat and is an oval-shaped diamond with blue hue that is internally flawless. As Blue Diamond is the only Diamond that is World's...