Emerald Gemstone & Information | Gemopedia by JTV | Gemopedia™
Few gemstones command as much desire and passion as emerald. Since antiquity, emerald's rich "green fire" has symbolized eternal spring and immortality. Long shrouded in myth and lore, it has reigned as the supreme green gem with no indication that its position will ever change. The favorite of Cleopatra, Spanish Conquistadors and today's Red Carpet, wars have waged over this treasured stone. In the 1st century AD, Roman historian Pliny the Elder wrote that "nothing greens greener" than emerald a sentiment that continues today, as it remains one of the most sought-after gems on the market. The beautiful green hues of this beryl variety, combined with its rarity, make it one of the world's most valuable gemstones.
Light to Very Dark Green To Bluish Green
Emerald classificationCommonNameEmeraldSpeciesBerylVarietyEmeraldColorsLight to Very Dark Green To Bluish GreenAlternateNamesGemstoneGroupsBerylKeySeparationsrefractive index, birefringence, optic character, pleochroism, spectrum and possibly magnificationClassificationCommentsDue to their included nature emeralds are almost always oiled. Chatoyancy and asterism are possible in emeralds.
Emerald chemistry & crystallographyChemicalNameberyllium aluminum silicateChemicalFormulaBe3Al2(SiO3)6SynthesisCrystalSystemHexagonalChemistryClassificationSilicateNatureNaturalCrystallinityCrystallineChemistryComments
Emerald optical propertiesTransparencyTransparent - TranslucentDispersionStrength: weak fire Value: 0.014OpticalCommentsRefractiveIndex1.577-1.6
Tolerance:(+0.017/-0.017)Birefringence0.005-0.009OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Inert to weak orangy red to red
LWUV: Inert to strong orangy red to redCCFReactionSome appear pink or red; not diagnostic.PleochroismDichroic, moderate to strong, varying shades of body color
Emerald characteristic physical propertiesHardness7.5CharacteristicCommentsStreakWhiteSpecificGravity2.67-2.9 Range:0.18/-0.05 Typical:2.72ToughnessPoorInclusionsEmerald is a type III clarity stone. 3-phase inclusions typical of Colombian material. 2-phase inclusions usually found in stones from India. Tremolite needles are typical of Zimbabwe stones. Actinolite needles can be found in Siberian stones. Emeralds sometime have tube-like and bamboo-like inclusions, liquid and fingerprint inclusions, calcite, pyrite, mica, needles and amphibole inclusions.LusterVitreousStabilityFairFractureConchoidalCleavagePoor, in one direction