Natural Diamonds | Diamond Stone – GIA C
WEBAbout Diamond. Diamond forms under high temperature and pressure conditions that exist only about 100 miles beneath the earth’s surface. Diamond’s carbon atoms are bonded in essentially the same way in all directions. Another mineral, graphite, also contains only carbon, but its formation process and crystal structure are very different.
Gemological Institute Of America | All About Gemstones - GIA
WEBEstablished in 1931, GIA is an independent nonprofit that protects the gem and jewelry buying public through research, education and laboratory services.
Birthstones | Birthstone by Month - GIA
WEBAquamarine and bloodstone are the two birthstones for March. One evokes blue skies and calming waters while the other represents health and strength. Learn more about these two March birthstones and where they can be found. Those born in the month of April are lucky enough to call the diamond, a scintillating stone, their birthstone.
Sapphire Gemstone | Sapphire Stone - GIA
WEBAbout Sapphire. Besides blue sapphire and ruby, the corundum family also includes so-called “fancy sapphires.”. They come in violet, green, yellow, orange, pink, purple, and intermediate hues. Some stones exhibit the phenomenon known as color change, most often going from blue in daylight or fluorescent lighting to purple under incandescent ...
GIA - Report Check
WEBGIA reports represent the highest standard of reliability, consistency and integrity. And now, GIA Report Check is available for all GIA reports, providing you with an additional level of assurance. With Report Check, you can quickly and conveniently confirm that the information on your report matches what is archived in the GIA report database.
What Is Moonstone Gemstone | Moonstone Stone – GIA
WEBAbout Moonstone. Moonstone is a variety of the feldspar-group mineral orthoclase. During formation, orthoclase and albite separate into alternating layers. When light falls between these thin layers it is scattered producing the phenomenon called adularescence. Adularescence is the light that appears to billow across a gem.
GIA - Report Check
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August Birthstones | Peridot & Spinel Birthstone Information - GIA
WEBPeridot, spinel and sardonyx are the three birthstones for August. The peridot birthstone is known for being formed under extreme conditions, as it can be found in the hardened lava that carried it from deep within Earth’s mantle as well as in meteorites that traveled from outer space. The spinel birthstone was underappreciated until recently ...
Emerald Gemstone | Emerald Stone - GIA
WEBEmerald. Emerald is the bluish green to green variety of beryl, a mineral species that includes aquamarine. Color. Highly saturated green color defines high quality emerald. Beveled corners. See gem as. Polished. Rough. Tools.
Opal Gemstone | Opal Stone - GIA
WEBAbout Opal. Because opal has the colors of other gems, the Romans thought it was the most precious and powerful of all. The Bedouins believed that opals contained lightning and fell from the sky during thunderstorms. When Australia’s mines began to produce opals commercially in the 1890s, it quickly became the world’s primary source for ...
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