What is Sunstone?|
March 9, 2014 | Geology.com
What happens when minute flakes of copper in a common orientation are scattered through a piece of transparent feldspar?
March 6, 2014 | Geology.com
Although most gemstones are mineral materials, a number of organic materials and fossilized organisms are considered to be gemstones. The most common of these are pearl, bone, amber, coral, ivory, petrified wood, fossil coral, dinosaur bone and more.
Default on the World Record Diamond?|
March 6, 2014 | Jewish Business News
In late 2013 Sothbey’s sold a 60 carat fancy vivid pink diamond for a record price of $83 million – the highest price ever paid for a diamond of any kind. Now the buyer is unable to pay.
Related: How do diamonds form?
February 27, 2014 | Geology.com
Chrysoberyl is an extreme gem. At 8.5 on the Mohs Scale it is the third hardest gem mineral. At 3.7 to 3.8 it has a very high specific gravity for a non-metallic mineral. It is the gem with the finest cat’s eye. And, some specimens change color depending upon the type of incident light.
Geology of Diamonds|
February 18, 2014 | GeoscienceWorld.org
An interesting article on “Diamonds and the Geology of Mantle Carbon” that considers the various types of diamonds, their host rocks, inclusions, geographic distribution, environments of formation, age, trace element composition, textures, carbon/nitrogen isotopes, geobarometry, and lots more.
Tucson Gem and Mineral Show Interview|
February 13, 2014 |
The Arizona Geological Survey just published a special episode of Arizona Mining Review. Lee Allison interviews Peter Megaw, Exhibits Chair of The 60th Annual Tucson Gem and Mineral Show which begins today. At least 40 other gem, mineral, fossil and jewelry shows have been occurring in Tucson for the past few weeks.
How to Tell Diamond from CZ|
February 13, 2014 | Business Insider
A short video on Business Insider explains how jewelers can distinguish diamonds from cubic zirconia – CZ has much higher specific gravity and dispersion.
February 2, 2014 | Geology.com
“Fire Opal” is a term used for colorful, transparent to translucent opal with a background color that is a fire-like hue of yellow to orange to red. It might or might not exhibit “play-of-color”.
Related: Photos of Many Types of Opal
Popular for January 2013|
February 2, 2014 | Geology.com
The Polar Vortex
Hot Rock Under the Atlas Mountains
Big Rare Earth Find in North Korea?
Horizontal Well Density in the Utica Shale of Ohio
Big Blue Diamond Found in South Africa
Ice Quake in Wisconsin?
Wow! The Best Snowflake Photos
Why Was It So Cold Last Week?
Diamonds in the Afterlife?|
February 2, 2014 | National Public Radio
A few companies are producing “memorial diamonds” from the remains of cremated humans. For a few thousand dollars you can have a 1/4 carat (about 4 mm) diamond produced after your death for your heirs.
Big Blue Diamond Found in South Africa|
January 23, 2014 | Reuters
A blue diamond about the size of an acorn and weighing 29.6 carats has been discovered in South Africa by Petra Diamonds.
Most Popular Items for December|
January 2, 2014 | Geology.com
The Saturn Hexagon?
The Utah Supervolcano
What is Ammolite?
Landslide on an Incredible Scale
Failure of the Midcontinent Rift
Zoom in on the San Andreas Fault
Price of Gold Falling
Size of the Yellowstone Magma Chamber Severely Underestimated?
Salaries and Employment of Recent Geoscience Graduates
The Largest Recorded Fault Slip
How Do They Steer the Horizontal Drill?
What is Ammolite?|
December 17, 2013 | Geology.com
Ammolite is a trade name given to a thin iridescent aragonite shell material that is found on two species of extinct ammonite fossils (Placenticeras meeki and Placenticeras intercalare). Gem-quality Ammolite produces a spectacular display of iridescent color when it is observed in reflected light. The colors of an individual stone can run the full range of the visible spectrum or be limited to just one or two colors. The color display can rival fine opal and labradorite in its intensity and beauty.
December 15, 2013 | Geology.com
Turquoise is a blue to blue-green gem material that has been used by people worldwide for over 6000 years.
2014 Mineral Shows|
December 12, 2013 | The-Vug.com
The-Vug.com has a comprehensive list of mineral shows for 2014. There are probably at least a couple of shows scheduled near you!
Coloured Gemstone Deposits in the Yukon|
December 10, 2013 | Yukon Geological Survey
Nice publications on the geology of gemstones are rare. Here is a nice open file report from the Yukon Geological Survey.
It is Open File Report 2004-10, “EXPLORATION CRITERIA FOR Coloured Gemstone Deposits in the Yukon” by Lori Walton.
December 3, 2013 | Geology.com
They are called “anthill garnets” because they are found on and around the margins of anthills. The ants encounter the garnets while excavating their underground passages, haul them to the surface and discard them.
Related: What is Garnet?
The Demand for Emeralds is Rising|
December 3, 2013 | CNN
“The price for high-quality emeralds has increased by a factor of 10 since 2009, and the price of Colombian emeralds is set to increase by at least 25% this year alone.” Quoted from the CNN article.
Most Popular Items for November|
December 2, 2013 | Geology.com
The World’s Largest Emerald Mine
What is Iris Agate?
New Volcanic Island Southeast of Japan
The Enormous Volcanic Eruption that Historians Never Recorded
A Super River from the Southwestern United States to the Labrador Sea?
Typhoon Haiyan Images
Comet Ison is Visible to the Naked Eye
New Super Predator Dinosaur
Rock, Mineral, Gem and Fossil Kits|
December 2, 2013 | Geology.com Store
The Geology.com Store has a nice selection of rock, mineral, gemstone and fossil kits for personal or classroom use.
What is Iris Agate?|
November 27, 2013 | Geology.com
““Iris Agate” is a name used for a finely-banded agate that produces a spectacular display of color when it is cut properly and illuminated from a direction that sends light through its very thin bands.”
Bill Magee the Gem Miner|
November 24, 2013 | YouTube.com
An interesting video about Bill Magee, a gem miner who lived and found lots of gems in southern California. (His big find – about 1 1/2 tons of morganite crystals – is at about 22:30.)
The Smithsonian Gem and Mineral Collection|
November 24, 2013 | Gemological Institute of America
The Gemological Institute of America has an article with five videos and a photo gallery that gives you a “behind the scenes” look at the Smithsonian Gem and Mineral Collection.
Fancy Vivid Pink Diamond Sells for $83 Million|
November 19, 2013 | Bloomberg
A fancy vivid pink diamond weighing 59.60 carats was sold last week in Geneva for $83 million. That is the highest price ever paid for any gemstone at auction.
Related: How do diamonds form?
The Worlds Largest Emerald Mine|
November 14, 2013 | Gemfields Plc on YouTube
This video shows a few activities at Gemfields’s Kagem Emerald Mine in Zambia.