Tag

Diamond

All articles tagged with #diamond

science25 days ago•31 min saved

Lab-made hexagonal diamond edges past regular diamond in hardness

Chinese researchers report synthesizing millimetre-sized bulk hexagonal diamond from oriented graphite under about 20 GPa and 1,300–1,900°C, with diffraction confirming a pure hexagonal carbon phase. They measured a hardness around 114 GPa, slightly higher than typical natural cubic diamond (~110 GPa), and highlight high thermal stability, addressing long-standing debate over hexagonal diamond and suggesting potential for advanced technological uses.

via Yahoo News Canada|

#carbon #diamond #hexagonal-diamond

science26 days ago•41 min saved

Lab-forged hexagonal diamond edges out natural diamond in hardness

Chinese researchers synthesized millimetre-sized, phase-pure hexagonal diamond in the lab by compressing highly ordered graphite between tungsten-carbide anvils at 20 gigapascals and heating to 1,300–1,900°C, yielding a material with about 114 gigapascals hardness—slightly tougher than natural cubic diamond—which could enable new technologies and settles long‑standing debates about the phase’s existence.

via Yahoo|

#carbon #diamond #hardness

physics-and-mathematics27 days ago•68 min saved

China produces pure hexagonal diamond and claims superior hardness over regular diamond

Chinese researchers created small, pure hexagonal diamond (lonsdaleite) samples and demonstrated that it is stiffer and harder than cubic diamond and more oxidation-resistant; the 1.5 mm samples were formed by compressing organized graphite at about 20 GPa for 10 hours and heating to roughly 1,300–1,900°C, with the work published in Nature, indicating a feasible bulk production method and potential industrial applications in drilling, cutting, and thermal management.

via Live Science|

#diamond #hardness #hexagonal-diamond

science3 months ago•4 min saved

Miners Discover 37.4-Carat Unique Diamond

A rare 37.4-carat diamond discovered in Botswana exhibits a unique dual structure, with one half pink and the other colorless, revealing insights into its two-stage formation process and deep mantle geological conditions, linked to tectonic rifting events.

via Indian Defence Review|

#botswana #diamond #geology

science4 months ago•3 min saved

Miners Uncover 37.4 Carat Pink-Colorless Diamond

A rare 37.4-carat rough diamond split evenly between pink and colorless was discovered in Botswana's Karowe mine, providing valuable insights into diamond formation and the geological processes that create unique colors, especially pink, due to structural deformation. The find offers a natural record of Earth's ancient crustal movements and deformation history, aiding scientific understanding of diamond color origins and geological history.

via Earth.com|

#botswana #diamond #geology

world5 months ago•2 min saved

‘Mellon Blue’ Diamond Sells for Over $25 Million at Swiss Auction

The 'Mellon Blue' diamond, a nearly 10-carat blue gem named after Rachel Mellon, sold for $25.6 million at a Swiss auction, reflecting market caution amid geopolitical tensions, and marking a significant but lower-than-expected sale compared to past records.

via AP News|

#auction #blue-diamond #diamond

business5 months ago•2 min saved

'Mellon Blue' Diamond Fetches $26.6M at Swiss Auction

A nearly 10-carat blue diamond called 'Mellon Blue' sold for $26.6 million at Christie's auction in Switzerland, reflecting market caution amid geopolitical tensions, and was previously sold for $32.6 million in 2014. The gem is renowned for its shape and color, and the auction was part of a two-day jewelry event in Geneva.

via abcnews.go.com|

#auction #blue-diamond #business

science5 months ago•4 min saved

Family Discovers 2.79-Carat Diamond with Dollar Store Tools

A family in Arkansas found a 2.79-carat brown diamond at Crater of Diamonds State Park using simple tools, highlighting the park's unique geology and the natural history of diamonds formed deep within the Earth. The discovery underscores the park's status as a rare public source of diamonds and the importance of patience and technique in gemstone hunting.

via Earth.com|

#arkansas #brown-diamond #crater-of-diamonds

science5 months ago•6 min saved

Scientists Discover New Temporal Order in 'Rondeau' Crystal

Scientists have experimentally observed a new phase called the time 'rondeau' crystal, where long-range temporal order coexists with short-term disorder in nuclear spins within diamond, demonstrating a novel form of non-equilibrium matter that combines predictable periodic behavior with controllable randomness.

via Phys.org|

#diamond #quantum-spins #science

world5 months ago•1 min saved

Florentine Diamond, Lost for a Century, Discovered in Canadian Vault

A 137-carat Florentine Diamond, once owned by European royal families and thought to have vanished, was discovered in a Canadian bank vault after being kept secret for nearly a century due to family vows. The Habsburg descendants revealed the diamond's location and expressed interest in exhibiting it publicly in Canada, emphasizing its historical significance.

via ARTnews.com|

#canada #diamond #habsburg

science6 months ago•16 min saved

Enhancing Quantum and Solid-State Sensor Sensitivity with Asymmetric Echo Techniques

The article reports on the achievement of spin squeezing in an ensemble of nitrogen-vacancy centers in diamond, demonstrating enhanced quantum sensing capabilities through entanglement and reduced quantum noise, with data available at Harvard Dataverse.

via Nature|

#diamond #nitrogen-vacancy-centers #quantum-entanglement

science7 months ago•1 min saved

Diamonds' Quantum Emitters Pave Way for Novel Coupling Technologies

Researchers at The City College of New York discovered that nitrogen-vacancy (NV) centers in diamond can interact with engineered photonic structures in novel ways, enabling new coupling mechanisms that could advance quantum information technologies and sensing applications, including detecting chiral molecules.

via Phys.org|

#diamond #nv-center #quantum-emitter

world7 months ago•7 min saved

Woman Discovers 2.3-Carat Diamond in Arkansas Park

Micherre Fox, a woman from Manhattan, spent three weeks at Arkansas' Crater of Diamonds State Park searching for a diamond and unexpectedly found a 2.3-carat white diamond, which she plans to use for her engagement ring, symbolizing her commitment and hard work.

via The New York Times|

#arkansas #crater-of-diamonds #diamond

world8 months ago•2 min saved

Woman Finds $27,000 Diamond at Arkansas State Park After 3 Weeks of Searching

A woman from New York, Micherre Fox, spent three weeks at Arkansas's Crater of Diamonds State Park and found a 2.3-carat diamond, which she plans to use for her engagement ring, highlighting the park as a unique gem-hunting destination.

via ABC News|

#arkansas #crater-of-diamonds #diamond

world8 months ago•3 min saved

Woman Discovers $27,000 Diamond in Arkansas State Park

A woman from New York found a 2.30-carat diamond at Crater of Diamonds State Park in Arkansas after weeks of searching, which she plans to use for her engagement ring, highlighting the park's history of gemstone discoveries.

via USA Today|

#arkansas #diamond #discovery