On blue diamonds: One of the rarest gemstones in the world

Incredibly rare, natural blue diamonds cannot be found commonly in the New Zealand market. In fact, they are so rare that they account for less than 0.1% of all diamonds produced. In a recent article from the Jewellery Editor, Andrew Coxon of the De Beers Institute of Diamonds stated:

“Only a few diamond mines produce blue diamonds and their value has soared in the past 10 years as more collectors seek to own one. However, their availability remains limited by Mother Nature – she stopped producing them at least one billion years ago”

Believed to be first mined in India during the 17th century, natural blue diamonds are now found more commonly in South Africa and parts of South America. Blue diamonds are typically created by the presence of boron impurities, however radiation and hydrogen can also help to create fancy blue colour in diamonds.

Blue diamonds pose issues for gem cutters in that when rough, they are an irregular shape and the intensity of their colour can vary within the stone. Cutters must determine how to get the most of the diamond through size, cut, clarity and colour. Cushion and pear shapes are common choices because of the way they highlight the stones colour.

Because of the scarcity of natural blue diamonds, London based jeweller David Marshall advised that when it came to selling a white diamond of F colour with the exact same carat weight and clarity as a fancy blue diamond  he predicted that “The blue diamond would retail for 2,200% more than the white.”

So unless your pockets are deep, these beauties will have to be admired from afar.

For more useful readings on blue diamonds, try:

The Jewellery Editor

The GIA Four C’s Blog

The Winston Blue Diamond