LSE-listed diamond miner Petra Diamonds has recovered a 23.16 carat pink diamond of exceptional colour and clarity from its Williamson mine in Tanzania.

The stone is an example of the high quality pink diamonds for which Williamson is known and is the most significant recovery by Petra from the mine to date.

Pink diamonds are only found in a handful of mines throughout the world and their rarity ensures that they are one of the most highly coveted of all the fancy colours.

The diamond will be offered for sale by appointment in Antwerp as part of Petra’s December tender process.

Williamson is an open pit operation based upon the 146 ha Mwadui kimberlite pipe, which is the world’s largest economic kimberlite to have seen continuous mining.

Despite having been in operation since 1940, the pit is only 90 m at its deepest point due to the large size of the deposit and the pipe still contains a major diamond resource of approximately 38.1 Mct. The deposit's low grade is countered by the high value of its diamonds and lends itself well to high volume, bulk mining methods.

Williamson is renowned for beautifully rounded white goods and ‘bubblegum’ pink diamonds, including the 23 carat Williamson Pink (54 carat rough stone), which is considered to be one of the finest pink diamonds ever recovered.

Petra Diamonds is now implementing an expansion plan to increase production from circa 200 000 ctpa in FY2015 to circa 350 000 ctpa by FY2017.

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