Blog - Grand Auctions


Diamond mining company Alrosa have found a 102.85 carat diamond in their Jubilee kimberlite pipe in Siberia, Russia. One of the largest diamond mines in the world, it has estimated reserves of more than 170 million carats, and has a solid reputation for large diamond finds.

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  • Posted by Simon Rufus

Petra diamonds, who own the famous Cullinan mine in South Africa, have announced that they have found a 122.5 carat blue diamond there. 109 years ago the mine produced the largest piece of gem quality diamond ever discovered, the Cullinan stone. To read more about this discovery, read our blog The Cullinan II Diamond.

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  • Posted by Simon Rufus
loose rough emeralds

Emerald is the green variety of the mineral beryl. It is coloured green by tiny amounts of chromium and sometimes vanadium. Aquamarine is another example of the mineral beryl except that it is blue. Other varieties include heliodor (yellow), morganite (pink), bixbite (red) and goshenite (colourless).

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  • Posted by Simon Rufus
Ekati diamond mine Canada

As the weather men finally promise a raise in temperatures for the UK, spare a thought for those miners working at the Ekati Diamond Mine in Canada's Northwest territories. The mine is situated 120 miles south of the Arctic circle in an area covered by tundra, lakes, rivers and marshes. It is a humid subarctic continental climate with cool summers and no dry season. The average temperature typically varies from -31°C to 18°C but is rarely below -38°C or above 23°C.

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  • Posted by Simon Rufus
Kimberley diamond mine, South Africa

In the latter half of the nineteenth century, farmers, and especially their young children, would periodically find rough, alluvial diamonds. Washed up in river beds, these early diamond finds were rarely recognised for what they actually were and the gems often remained in the homestead to be used as playthings!

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  • Posted by Simon Rufus
Cueva de los Cristales, Naica mine, Chihuahua, Mexico

‘Cueva de los Cristales’, or, ‘Cave of Crystals’, is a giant underground cave containing some of the largest, naturally growing crystals ever found on earth. It is situated 300 metres below the surface in Naica, Chihuahua, Mexico. The crystals here are formed of selenite or gypsum and are a brilliant, clear, luminous white. The largest crystal here measures 12 metres in length, 4 metres in diameter and weighs an estimated 55 tons!

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  • Posted by Simon Rufus
Argyle pink Jubilee diamond

An incredible discovery was made at the Argyle diamond mine in the East Kimberley region of a remote northern corner of Western Australia a couple of weeks ago. Miners there found a rough pink diamond weighing 12.76 carats, the largest such stone found in the country. Estimated to be worth millions, the diamond has been named the Argyle Pink Jubilee and will be cut and polished over a period of ten days in Perth, before being sold later this year.

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  • Posted by Simon Rufus

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