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Large Yellow Rough Diamond unearthed

ALROSA’s affiliate Almazy Anabara has extracted a large 34.17-carat yellow diamond. It is the largest fancy-colored rough diamond extracted by the Company this year. The...

Diamonds show Earth still capable of ‘superhot’ surprises

Diamonds may be 'forever' but some may have formed more recently than geologists thought. A study of 26 diamonds, formed under extreme melting conditions...

‘Super-deep’ diamonds may hold new information about Earth’s interior

Researchers at Tohoku University believe that it is possible for natural diamonds to form at the base of the Earth's mantle (Fig.1). The formation...

Deep mantle chemistry surprise: Carbon content not uniform

Even though carbon is one of the most-abundant elements on Earth, it is actually very difficult to determine how much of it exists below...

The case of the missing diamonds

It all began innocently enough. Tyrone Daulton, a physicist with the Institute for Materials Science and Engineering at Washington University in St. Louis, was...

Biggest and best diamonds formed in deep mantle metallic liquid

New research from a team including Carnegie's Steven Shirey and Jianhua Wang explains how the world's biggest and most-valuable diamonds formed—from metallic liquid deep...

“Argyle Pink Jubilee” Largest Pink Diamond in Australia

An Australian mining company says it has found a 12.76-carat pink diamond, the largest rough pink diamond found in the country. The rare diamond was...

Blue Diamond ‘Worth 10 Millions’ Discovered

A massive diamond with a possible price tag of more than £36m has been discovered at a mine in South Africa. The 29.6 carat blue...

Diamond collection brings deep Earth to the surface

Researchers at the Denver Museum of Nature & Science and University of British Columbia recently analyzed diamonds from the Museum's collection and learned how...

Diamonds help generate new record for static pressures for study

Extraordinary things happen to ordinary materials when they are subjected to very high pressure and temperature. Sodium, a conductive metal in normal conditions, becomes...

Some islands started in diamond-bearing regions under continents, geochemists say

The raw materials of some volcanic islands are shaped by some of the same processes that form diamonds deep under the continents, according to...

Natural Diamond Colors

Diamond is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a...

Ultra-thin slices of diamonds reveal geological processes

Diamonds are not only beautiful and valuable gems, they also contain information of the geological history. By using ultra-thin slices of diamonds, Dorrit E....

How Diamonds Are Formed

Diamond is a metastable allotrope of carbon, where the carbon atoms are arranged in a variation of the face-centered cubic crystal structure called a...

Largest rough diamonds recovered in the Russia “241.21-carat”

PJSC ALROSA, the world leader in diamond mining, announces the recovery of a 241.21-carat rough diamond from Nyurbinskaya pipe. It is one of the largest...

4Cs of Diamond Quality: What’s the Most Important C?

If you’re asking, “What is the most important C?”, chances are you’re already well into the process of purchasing a diamond engagement ring. When...

The Biggest Violet Diamond Rio Tinto has ever found

Rio Tinto’s Argyle Pink Diamonds business has unveiled the largest violet diamond recovered from the  Argyle mine in Western Australia. The 2.83 carat polished oval...

Geologists Discover Origin of Earth’s Mysterious Black Diamonds

January 8, 2007ـــــ If indeed "a diamond is forever," the most primitive origins of Earth's so-called black diamonds were in deep, universal time, geologists...

Largest blue diamond to appear at Hong Kong auction

The largest oval fancy vivid diamond ever to appear at auction is headed for sale in Hong Kong next month, where it is expected...

Graphite Inclusions Forming Octahedral Outline in Diamond

Primary diamond deposits are usually found in mantle-derived igneous rocks, with the principal hosts being kimberlite and lamproite. During the ascent to the earth’s...

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