A collection of rare pink diamonds from Australia’s now closed Argyle mine are expected to break records at auction this month.

The 11 stones, originally from the mine in Western Australia, will be put up for the first ever public tender of pink diamonds later this month in Sydney.

Until it was closed last November, the Argyle mine produced 90% of the world’s pink diamonds. Its closure has increased the value of the stones.

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The 11 diamonds are part of a wider offering of 30 stones set to go up for auction, expected to sell for between A$12 million to A$18 million (£6.6 million to £9.9 million).

Yourdiamonds.com public tender director, Tim Goodman, said: “In my 40 years in the jewellery auction business I have never seen a private collection like this anywhere in the world.

“There had been whispers about the collection over the years. When I received the call and subsequently first viewed the diamonds, I could not believe my eyes.

“Handling the sale of this collection will be a career highlight for me. There has never been such a large and valuable group of pink diamonds offered for public sale.”

Read more about yourdiamonds.com and its Argyle pink diamonds below:

First ever public tender for Australian pink diamonds