Blue Diamonds

The key to purchasing the right colour natural blue diamond

Blue diamonds are extremely rare. Many originate from the Cullinan diamond mine in South Africa which is the only notable blue diamond production mine. The Cullinan mine also produced the largest diamond of the De Beers Millennium jewels collection which is a brilliant vivid blue heart of eternity diamond that is 27 carats in weight.

In fact another world famous blue diamond, the 'Hope' diamond, is 45.52 carats and is a fancy deep blue diamond that is cut into a round brilliant shape. It was given additional facets to bring out the rich colour and sparkle of the diamond. The 'Hope' diamond was the diamond worn by Kate Winslet in the movie 'Titanic' when she was painted as "Rose" by "Jack Dawson" (Leonardo DeCaprio). The movie Titanic played had a big impact in educating the public about blue diamonds.

Blue diamonds come in a wide range of shades from ice blue to a rich deep blue.

Accurate proportions are very important in blue diamonds as they are with any diamond. Proportion is such an important aspect of the "cut" of a diamond and even more so for coloured diamonds. Blue diamonds that are too dark because of bad proportion fail to reflect the maximum amount of light.

All natural blue diamonds belong to a type 11b which are diamonds that have no nitrogen but boron which is an element that absorbs red, orange and yellow light therefore they appear blue or grey or nearly colourless.

Blue natural diamonds make up 0.1% of all the diamonds.


About Buying Diamonds is a comprehensive guide explaining diamond characteristics like cut, colour, clarity & carat, as well as the different diamond shapes and types of diamonds. You can learn what to buy for your diamond jewellery needs such as diamond rings or diamond bracelets and how these grades will affect diamond prices. The process of buying diamonds online may be daunting to some, so throughout this site we offer advice and information on buying all types of diamonds including loose diamonds and wholesale diamonds and the reasons why you should always buy certified diamonds.