Blue diamond anniversary rings are also able to bring a special attention to the fingers of the wearer, which will make him/her look a lot more beautiful. The Hope Diamond is one of the most famous blue diamonds to be ever discovered. This 45.52 carat fancy-dark grayish-blue colored gemstone was donated to the Smithsonian museum back in the year 1958. Even though the value of this diamond is unknown, experts claim that it would be around 250 million dollars. The Heart of Eternity is another famous blue diamond that occurred naturally in the crust of the earth. The fancy vivid blue colored 27.64-carat gemstone was discovered in South Africa’s Premier Diamond Mine. The price of this stunning gemstone is estimated to be around 80 million dollars. In fact, several expert diamond collectors claim that the value of 1 carat of the diamond will be more than 3 million.