News tagged with gemstone
Gemstone
A gemstone or gem (also called a precious or semi-precious stone, a fine gem, or jewel) is a piece of mineral, which, in cut and polished form, is used to make jewelry or other adornments. However certain rocks, (such as lapis lazuli) and organic materials (such as amber or jet) are not minerals, but are still used for jewelry, and are therefore often considered to be gemstones as well. Most gemstones are hard, but some soft minerals are used in jewelry because of their lustre or other physical properties that have aesthetic value. Rarity is another characteristic that lends value to a gemstone. Apart from jewelry, from earliest antiquity until the 19th century engraved gems and hardstone carvings such as cups were major luxury art forms; the carvings of Carl Fabergé were the last significant works in this tradition.
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Lunar discovery: Two new moon rock types
Many of us think of our nearest celestial neighbor as having few secrets to give up. However, we are still finding out new things about the moon. The latest discovery is of two types of moon rock not seen ...
New Moon Rock Is Fit for a King
(PhysOrg.com) -- People don't discover a new type of moon rock every day, so consider the odds of finding one rich in a mineral that England's King Henry V wore on his battle helmet. And then imagine spotting, ...
Space & Earth / Space Exploration
Apr 09, 2010 |
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A blue gem for greener fuel
(PhysOrg.com) -- Sapphire, a brilliant blue gemstone most familiar in jewelry, may soon play an important part in making coal a cleaner fuel source.
Mar 19, 2010 |
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Getting the most out of gemstones
Emeralds, rubies and the like are referred to as colored gemstones by experts. They sparkle and shine with varying intensity, depending on the cut. A new machine can achieve the best possible cut and extract ...
Jun 25, 2009 |
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Search results for gemstone
NIST polishes method for creating tiny diamond machines
(PhysOrg.com) -- Diamonds may be best known as a symbol of long-lasting love. But semiconductor makers are also hoping they'll pan out as key components of long-lasting micromachines if a new method developed ...
Nanotechnology / Nanomaterials
Sep 28, 2011 |
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How diamonds emerge from graphite
Scientists have used a new method to precisely simulate the phase transition from graphite to diamond for the first time. Instead of happening concerted, all at once, the conversion evidently takes place in ...
Sep 21, 2011 |
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Researchers make visible the structure of the smallest crystals
A radical new way of making structures visible at the nano level has been developed at Johannes Gutenberg University Mainz (JGU, Germany). This new method makes it possible to determine with precision the ...
Sep 20, 2011 |
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Earth from space: African gem
(PhysOrg.com) -- This Envisat image shows southern Namibia and northern South Africa on Africa's lower-west coast.
Space & Earth / Earth Sciences
Aug 15, 2011 |
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History shines through the glass
All glass is beautiful, Belgian researcher Patrick Degryse said, gently turning a delicate, Roman-era vessel, its bluish sheen glowing under the fluorescent lights of the Semitic Museums ...
Other Sciences / Archaeology & Fossils
Jun 14, 2011 |
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Spitzer sees crystal 'rain' in outer clouds of infant star
(PhysOrg.com) -- Tiny crystals of a green mineral called olivine are falling down like rain on a burgeoning star, according to observations from NASA's Spitzer Space Telescope.
May 27, 2011 |
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Workshop offers geeks industrial-strength toys
(AP) -- In the tech-obsessed South of Market neighborhood that digital sensations like Twitter and Zynga call home, a newfangled workshop for would-be inventors blends a startup sensibility with the area's ...
Mar 28, 2011 |
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Seeing in stereo: Engineers invent lens for 3-D microscope
Engineers at Ohio State University have invented a lens that enables microscopic objects to be seen from nine different angles at once to create a 3D image.
Mar 21, 2011 |
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Diamonds not always a girl's best friend
With Valentines Day around the corner, jewelers are gearing up for a busy period as happy couples come shopping for the perfect engagement ring. Top of the list is the classic diamond, and this year there are more choices ...
Feb 11, 2011 |
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Scientists advance the understanding of the big getting bigger
Patricia Thiel of Iowa State University and the Ames Laboratory put a box of tissues to the right, a stack of coasters to the middle and a trinket box to the left.
Nov 04, 2010 |
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List of search results for gemstone