* Astronomy

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RE: Gems & Jewellery

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'Car boot-sale' diamond set to fetch £350,000 at auction

A diamond ring bought for £10 at a car-boot sale 30 years ago is expected to fetch £350,000 at auction.
The owner believed the "exceptionally sized" stone was a piece of costume jewellery when she bought it at West Middlesex Hospital in Isleworth, west London, in the 1980s.
Unaware it was a 26 carat, cushion-shaped white diamond from the 19th Century, she wore it daily for decades.
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Pink Star diamond sets new world record in Hong Kong

A rare diamond known as the Pink Star has been sold in Hong Kong for more than $71m (£57m), setting a new world record for any gemstone at auction.
The oval-shaped 59.6 carat stone was bought after just five minutes' bidding at Sotheby's, reports said.
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Sierra Leone pastor finds huge diamond in Kono

A Christian pastor has discovered one of the world's largest uncut diamonds in Sierra Leone's Kono district.
The diamond, weighing 709 carats, is now locked up in Sierra Leone's central bank in Freetown. It is one of the 20 largest diamonds ever found.
Freelance, or artisanal, miners are common in Sierra Leone's diamond-rich areas, reports the BBC's Umaru Fofana.
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Australia: Carbon dating reveals 2,000-year-old pearl

Archaeologists have said that a natural pearl unearthed in a remote part of western Australia is more than 2,000 years old.
The pearl is described as "irreplaceable" by one of the senior researchers on the project, as it's the only one ever recovered from an ancient site in Australia.
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Most ancient Jewellery in the world discovered in Croatia

Spoiler

This jewellery dates back to 130 thousand years ago and was discovered in the north of todays Croatia. That's long before modern humans appeared in Europe. It was crafted from eagle claws which were found more than a century ago. They bear multiple cut marks and signs and had also been polished.

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Recent Advances in Understanding the Geology of Diamonds

It has been more than two decades since diamond ages have proven to be up to billions of years older than their host magmas of kimberlite or lamproite. Since then, there have been significant advances in the analysis of diamonds and their mineral inclusions, in the understanding of diamond-forming fluids in the mantle, and in the relationship of diamonds to the deep geology of the continents and the convecting mantle. The occurrence of natural diamonds is remarkable and important to earth studies. This article reviews current thinking of where, how, when, and why natural diamonds form.
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Flawless diamond sells for record $26.7m at auction

A flawless diamond has set a world auction record, selling for $26.7m (£17.5m).
The rare Botswana-mined 101-carat diamond was sold at a Christie's auction in Geneva.
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Mining company in South Africa finds rare blue diamond

A rare blue diamond has been unearthed at a mine in South Africa.
The 25.5-carat stone was recovered by Petra Diamonds at its Cullinan mine and is expected to bring large profits.
Experts say it could be worth more than $10 (£6m), and the find gave a boost to Petra's share price.
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Princie Diamond