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23.16ct pink diamond Recovery

23.16ct pink diamond recovery – from the Williamson mine in Tanzania

Petra diamond, the owner of the Williamson mine in Tanzania, recovered the 23.16ct pink diamond last Friday. The Williamson mine is one of the few mines in the world that the pink diamond can be found at.

The 23.16ct pink diamond was described by the mine’s owner of exceptional colour and clarity.

It was only last month that wrote about the Christie’s auction of a 16.08ct pink diamond, sold to a Hong Kong billionaire Joseph Lau for $28.5 million ($1.7 million per carat).

So what makes the pink diamonds so special?

Generally from all diamond mines only 1% will have a gem quality colour. Of this 1% only 1% will be pink diamonds. And it is their rarity that makes them special and sought after in auction sale especially the ones of exceptional size.

Petra Diamond will offer the 23.16ct pink diamond for sale in Antwerp this December. The estimated price is unknown yet however, we do know that the diamond is of a better quality than the 16.4t pink diamond that was found in September last year. We also know that that diamond was sold for £2.2 million.

How do the pink diamond get its colour?

We know that diamond gets their colour from traces of elements they absorb. For example blue diamond has boron traces and yellow diamond has traces of nitrogen. However, the pink diamond has no traces of elements in it. This lead scientific to believe that a sesmic shock that change the mulecular structure is what brings out the pink hue.

The Williamson is most famous for the sizeable 54.5 carat pink diamond mined in 1947. It was given by geologist John Williamson, the original owner of the mine, as a gift to then Princess Elizabeth and Prince Philip for their wedding.

The diamond was then cut to a round shape, leaving it with 23.6 carat, and was named the Williamson Pink. In 1952 the diamond was set by Cartier into a brooch.

The Williamson mine has been in operation for the past 75 years. So far it yield about 20 million carats but geologist suggest there are another 40million carats to be generated in years to come. This estimation is based on the average depth of the Williamson mine the, which at is around 30-35 meter deep. However, the mining can continue up to 350 meter in theory.

The Williamson Mine is currently co-owned by Petra Diamonds and the government of Tanzania, which holds a 25% stake.

The Blue Moon Diamond

The Blue Moon diamond – flawless on auction

This year November is a truly exciting month. Only last week I shared with you the details of the Christie’s cushion-shaped stone, dubbed “In the Pink”, that was to go on auction this Tuesday and is estimated to sell for $23-28 million or even higher. The day after that will be Sotheby’s auction with the amazing Blue Moon diamond.

The Blue Moon diamond is a “fancy vivid” blue diamond which may break a record as Sotheby’s listing its projected sale price at between $35-$55 million (32-51 million euros).


AP Images/Kirsty Wigglesworth Model Charlene Bonnithon wears the rare Blue Moon Diamond at Sotheby’s auction rooms in London.

The flawless “Blue Moon” stone was discovered in South Africa in January last year, and is the largest cushion-shaped stone in that category ever to appear at auction. The Gemological Institute of America (GIA) graded the diamond to be internally flawless” and it was categorised as vivid blue diamond.

Sotheby’s is aiming to beat its own record of colour diamonds. Their last record was set in November 2010 in Geneva, with a 24.78ct pink diamond, known as the Graff Pink, fetched $46 million. The record sale for a blue diamond so far came in November last year, when a 9.75 carats fetched $32.6 million at an auction in New York.

There is a good chance the record will be broken this Wednesday when the head of Sotheby’s international jewellery division describe the Blue Moon as “ “a simply sensational stone of perfect colour and purity.”

The Blue Moon weighs 12.03 carats and will be traveling for viewing in Hong Kong, London and New York before arriving to the auction in Geneva on November 11th.

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