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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
The Biron Hydrothermal Synthetic Emerald - GIA %PDF-1 6 %âãÏÓ 208 0 obj > endobj 225 0 obj > Encrypt 209 0 R Filter FlateDecode ID[454D67A3D330954A8530CCC714B217A9>] Index[208 50] Info 207 0 R Length 92 Prev
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
Durability Testing of Filled Emeralds - GIA Physical properties used to discriminate among fillers include their solid or liquid nature (liquids ooze out of fissures or move when approached by a hot point), viscosity, scent, and other properties not easi-ly ascertained within an emerald, such as specific gravity Optical properties include color and refrac-
Emerald Description - GIA Emerald is the green to bluish green variety of beryl, a mineral species that also includes aquamarine as well as beryls in other colors Gem experts differ on the degree of green that makes one stone an emerald and another stone a less-expensive green beryl
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
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
Colombian Trapiche Emeralds: Recent Advances in Understanding Their . . . Colombia is the traditional source of the world’s finest emeralds, including the famed trapiche crystals, with their distinctive texture resembling a wheel with six spokes This gemological curiosity, found exclusively in the black shales of the country’s western emerald zone, is linked to the peculiar structural geology of the deposits