Emerald (Synthetic Overgrowth Hydrothermal) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Emerald (Synthetic Overgrowth Hydrothermal)

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!

Colors

Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green

  • Emerald-synthetic-overgrowth-hydrothermal classification

    CommonName
    Emerald (Synthetic Overgrowth Hydrothermal)
    Species
    Synthetic Beryl
    Variety
    Synthetic Emerald
    Colors
    Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green
    AlternateNames
    Lechleitner Synthetic Emerald
    GemstoneGroups
    KeySeparations
    Refractive 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.
    ClassificationComments
    Misnomer: cultured emerald
  • Emerald-synthetic-overgrowth-hydrothermal chemistry & crystallography

    ChemicalName
    beryllium aluminum silicate
    ChemicalFormula
    Be3Al2(SiO3)6
    Synthesis
    overgrowth hydrothermal
    CrystalSystem
    Hexagonal
    ChemistryClassification
    Silicate
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Emerald-synthetic-overgrowth-hydrothermal optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    OpticalComments
    RefractiveIndex
    1.566-1.57
    Birefringence
    0.006-0.006
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Weak to moderate red in the synthetic layer
    LWUV: Moderate to strong red in the synthetic layer
    CCFReaction
    Often a bright red; not conclusive
    Pleochroism
    Dichroic, moderate to strong, varying shades of body color
  • Emerald-synthetic-overgrowth-hydrothermal characteristic physical properties

    Hardness
    7.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.68-2.7
    Toughness
    Good
    Inclusions
    The 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.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    Poor, in one direction