Emerald (Flux Growth) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Emerald (Flux Growth)

One method of synthesizing emeralds is called flux growth. During the flux growth process, flux, a substance that reduces the melting point of surrounding material, is combined in a metal-lined crucible with the elements that make up emerald. The crucible is heated until its contents are liquid and then it is allowed to cool very slowly. As cooling continues, the gem mineral crystallizes from the solution. Flux grown synthetic gems can take up to a year to grow to a facetable size, but the exceptional clarity of these gems is well worth the wait! Synthetic gems have the same chemical, optical, and physical properties of their natural counterparts, but are a more cost-effective alternative to a natural gem.

Colors

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

  • Emerald-flux-growth classification

    CommonName
    Emerald (Flux Growth)
    Species
    Beryl
    Variety
    Synthetic Emerald
    Colors
    Light To Very Dark Green To Strongly Bluish Green, Slightly Yellowish Green
    AlternateNames
    GemstoneGroups
    KeySeparations
    Refractive index, birefringence, optic character distinguished beryl from other materials, but magnification is essential for separating synthetic beryl from natural material.
    ClassificationComments
    Misnomer: cultured emeraldChatham material: RI 1.561 to 1.564, Fluorescence: stones will show a weak to moderate red in LW and SW but stronger reaction LW.Gilson I material RI: 1.564 to 1.569, SG: 2.66; Gilson II material RI: 1.562 to 1.567, SG: 2.66Gilson I & II material: Fluorescence: generally stones show a weak to moderate red reaction under LW and SW, but with a stronger reaction to LW; other stones might have weak to moderate yellowish green, yellow or orange reaction under LW and SW.Gilson III material RI:1.57 to 1.579, Fluorescence: Inert, SG 2.68 to 2.69.Russian material RI: 1.559 to 1.563 Fluorescence: stone will show a weak to moderate orange-red reaction under LW and they are inert to SW, SG: 2.66
  • Emerald-flux-growth chemistry & crystallography

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

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.014
    OpticalComments
    RefractiveIndex
    1.562-1.569
    Tolerance:(+/-0.003)
    Birefringence
    0.003-0.005
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    red
    Pleochroism
    Dichroic, moderate to strong, varying shades of body color
  • Emerald-flux-growth characteristic physical properties

    Hardness
    7.5
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.66-2.69
    Toughness
    Good
    Inclusions
    Flux grown emeralds might exhibit residual flux inclusions that look like wispy veils, fingerprints with interconnecting channels and sometimes the inclusions will appear course or give a cloudy or cottony appearance. Stones often show 2-phase inclusions. Occasionally platinum crystals from the crucible can be seen in the stone. Sometimes synthetic phenakite or chrysoberyl crystals can form. Stones often show uniform growth planes.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    Poor, in one direction