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Special Colors and Optical Effects of Oregon Sunstone: Absorption . . . Given this newly published research about the optical properties of the copper particles, we revisit the colors and optical effects of Oregon sunstone in order to provide a comprehensive explanation of the special properties of this unique gemstone
Emerald Gemstone | Emerald Stone - GIA Emerald is the green to greenish blue variety of the mineral Beryl Top fine quality Emerald Gems are even more valuable than diamonds
Emerald Quality Factors - GIA The most desirable emerald colors are bluish green to pure green, with vivid color saturation and tone that’s not too dark The most-prized emeralds are highly transparent Their color is evenly distributed, with no eye-visible color zoning
Emerald: The Superstar of Trapiche Gemstones - GIA The unique spoke pattern and variety of trapiche gemstones offer a natural geometric shape for jewelry designers looking for unusual, rare, and one-of-a-kind gemstones None, however, can match an emerald’s majestic beauty – the superstar of trapiche gemstones
The Biron Hydrothermal Synthetic Emerald - GIA The gemological properties of the Biron hydrothermal synthetic emerald Properties Pleochroisrn that overlap with those of natural Absorption emeralds spectruma from (400-700 nrn) differing geographic localities Color-filter reaction Specific gravity Luminescence to long- and short-wave U V Key identifying Refractive properties indices and
EMERALD - GIA 4Cs GIA Identifi cation Reports assess the characteristics of an emerald (weight, measurements, shape, cutting style and color), state whether it is natural or synthetic, and disclose detectable treatments
The Lennix Synthetic Emerald - GIA The Lennix synthetic emerald, currently n~anufactured in France, is a dark green, moderately transparent to translucent material grown by flux fusion With the microscope, zones of lighter and darker green are evident For the most part, the gemological properties of this synthetic emerald overlap those of natural einer-
Alexandrite Gemstone | Natural Alexandrite Stone - GIA Often described by gem aficionados as “emerald by day, ruby by night,” alexandrite is the very rare color-change variety of the mineral chrysoberyl Originally discovered in Russia’s Ural Mountains in the 1830s, it’s now found in Sri Lanka, East Africa, and Brazil, but fine material is exceptionally rare and valuable
Geographic Origin Determination of Emerald | Gems Gemology The hydrothermal metamorphic group contains emeralds from Colombia, Afghanistan, and China (Davdar), while the schist-hosted magmatic group includes emeralds from Zambia (Kafubu), Russia, Ethiopia, and Brazil, among others In many cases, this separation can be made based on gemological properties
Synthetic Emeralds Grown by Richard Nacken in the Mid-1920s Describes the chemical, morphological, and microscopic properties of the first gem-quality synthetic emeralds ever produced, offering a historical perspective on their development