We have all been to a jewelry store at one time or another and been amazed at some of the large and beautiful diamonds on display, but what makes the most famous diamonds so exciting and valuable? The simple answer is rarity but a common factor among these stunning gems is size. Some of the world's most valuable diamonds, like the 3106.75 Carat Cullinan, are the largest ever to be unearthed. However, there are diamonds less than 1 carat that have sold for a fortune. For example, the .95 Carat Hancock Red sold for $880,000. In the case of the Hancock Red its rare red color gives it more value. Many of these rare treasures have a long and interesting history. For more information on some of these wild natural crystals follow the link below.