When you give friends a Blue Diamond Visa Gift Card they will know you think very highly of them. Diamonds are rare, which is what makes them precious. Clear, or white, diamonds are the most common, out-numbering colored diamonds about 10,000 to 1 in carat weights mined. That makes colored diamonds quite rare, but of all the known diamond colors – yellow, pink, blue, green, orange and brown – blue is the rarest and most valuable. Give Blue Diamond Visa Gift Cards to your rare friends.