For centuries, diamonds have been a part of the human experience. They are both symbols of wealth and status as well as symbols of romance.

But when one thinks of diamonds, images in the mind may include advertisements for engagement rings or famous Hollywood movies. The most common stone used is a white diamond. But what about exotic blue diamonds?

Many people have heard of the famous Hope diamond, but many are not aware that it is a blue diamond. And other than the Hope diamond, there are many interesting things to know about blue diamonds.


  • Blue diamonds are extremely rare, with only a few places on the planet capable of producing them. The Cullinan mine in South Africa and the Argyle mine in Australia are the only mines where blue diamonds are found at this time.
  • Of all the diamonds mined in the world presently, blue diamonds make up below 1%. That is a very small number.
  • Chances are, if you own a blue diamond, you are in possession of something that is one billion years old.
  • According to geologists, blue diamond gems form in the hot layer between the earth’s crust and its core, at depths reaching 400 miles, over 500 million years ago.
  • Natural blue diamonds, in terms of rarity, are just as unusual as red, pink, and violet diamonds.
  • Some claim—based on their very high prices—that pink diamonds are more rare than blue, but that’s due to increased demand rather than reduced supply.
  • The component that gives diamonds their luxurious blue tint is boron, which is found in the ocean but nitrogen also has an impact on the intensity of their color.
  • If the blue diamond stone has a low-level of nitrogen when formed, then it will have a much richer blue color. The deeper the blue, the more valuable the diamond stone.
  • Manmade blue diamonds are actually just white diamonds treated with heat.
  • Because of the presence of boron, some natural blue diamonds are able to generate electricity!
  • The largest blue diamond gemstone is the Idol's Eye, weighing 70.21 carats. In 1865, the Idol's Eye made its debut at a Christie's sale in London.
  • Another famous blue diamond is The Blue Moon of Josephine. It is a flawless blue diamond that a Hong Kong billionaire bought for his 7-year-old daughter and named it after her. The Blue Moon of Josephine weighs 12.03 carats, it sold for about $48.4 million in 2015.
  • Blue diamonds symbolize good health, peace, serenity and affection in life.