Emerald (Synthetic Overgrowth Hydrothermal) Gemstone & Information | Gemopedia by JTV | Gemopedia™
Synthetic refers to a man-made material with a natural counterpart. The synthetic crystal replicates the chemical, optical and physical properties of the natural crystal with little or no variation. One of the most popular methods for creating synthetic emerald is the hydrothermal process, which uses heat and pressure to imitate natural conditions deep in the earth that formed natural gems. Nutrients are dissolved in a water solution with synthetic crystals forming as the solution cools. Synthetic emeralds offer you the best of both worlds. You get the beauty of a beloved, rare gemstone, but at a budget-friendly price!
Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green
Emerald-synthetic-overgrowth-hydrothermal classificationCommonNameEmerald (Synthetic Overgrowth Hydrothermal)SpeciesSynthetic BerylVarietySynthetic EmeraldColorsLight To Very Dark Green To Strongly Bluish Green, Slightly Yellowish GreenAlternateNamesLechleitner Synthetic EmeraldGemstoneGroupsKeySeparationsRefractive index, birefringence, optic character distinguished beryl from other materials, but magnification is essential for separating synthetic beryl from natural material. Overgrowth synthetic emerald reveals itself in differences between the natural seed core and the synthetic layer grown over the seed.ClassificationCommentsMisnomer: cultured emerald
Emerald-synthetic-overgrowth-hydrothermal chemistry & crystallographyChemicalNameberyllium aluminum silicateChemicalFormulaBe3Al2(SiO3)6Synthesisovergrowth hydrothermalCrystalSystemHexagonalChemistryClassificationSilicateNatureSyntheticCrystallinityCrystallineChemistryComments
Emerald-synthetic-overgrowth-hydrothermal optical propertiesTransparencyTransparent - TranslucentDispersionOpticalCommentsRefractiveIndex1.566-1.57Birefringence0.006-0.006OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: Weak to moderate red in the synthetic layer
LWUV: Moderate to strong red in the synthetic layerCCFReactionOften a bright red; not conclusivePleochroismDichroic, moderate to strong, varying shades of body color
Emerald-synthetic-overgrowth-hydrothermal characteristic physical propertiesHardness7.5CharacteristicCommentsStreakWhiteSpecificGravity2.68-2.7ToughnessGoodInclusionsThe colorless beryl core can sometimes be seen underneath the synthetic emerald layer. Immersion is sometimes helpful to detect the overgrowth or sandwich layers. Overgrowth stones will have natural emerald inclusions in the core and will have a poor polish to avoid removing the synthetic overgrowth layer. The surface of the stone might exhibit oriented strain cracks.LusterVitreousStabilityGoodFractureConchoidalCleavagePoor, in one direction