Opal (Synthetic) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Opal (Synthetic)

Some gems, like opal, are highly coveted but rare to find, much less in the sizes and quality people dream of owning. Synthetic, or laboratory created jewels, offer you the best of both worlds. You get the beauty of a beloved, rare gemstone, but at a budget friendly price. The term 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.

Colors

Orangy Red, Red, Light To Dark Pink, Blue To Grayish Blue, Green To Bluish Green, Orange, Yellow, Light To Dark Brown, Gray, Bluish Gray

  • Opal-synthetic classification

    CommonName
    Opal (Synthetic)
    Species
    Opal
    Variety
    Colors
    Orangy Red, Red, Light To Dark Pink, Blue To Grayish Blue, Green To Bluish Green, Orange, Yellow, Light To Dark Brown, Gray, Bluish Gray
    AlternateNames
    Gilson Opal
    GemstoneGroups
    KeySeparations
    Magnification possibly fluorescence and phosphorescence
    ClassificationComments
    Newer untreated red to orange, gray-blue, white to colorless and gray to black stones have an SG between 2.22 to 2.27. Polymer impregnated stones have an SG between 1.88 to 1.91.
  • Opal-synthetic chemistry & crystallography

    ChemicalName
    silica
    ChemicalFormula
    SiO2.nH2O
    Synthesis
    chemical precipitation with controlled hydrostatic pressure
    CrystalSystem
    NA
    ChemistryClassification
    Silicate
    Nature
    Synthetic
    Crystallinity
    Amorphous
    ChemistryComments
  • Opal-synthetic optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.43-1.47
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Pleochroism
    None
  • Opal-synthetic characteristic physical properties

    Hardness
    4.5-6
    CharacteristicComments
    Streak
    SpecificGravity
    1.97-2.2
    Toughness
    Varies
    Inclusions
    You can see the columnar structure of synthetic opal when viewed from the side. The stones play of color patterns often look like snake skin or chicken wire under magnification. Stones with vivid colors are probably polymer impregnated.
    Luster
    Vitreous
    Stability
    Poor
    Fracture
    Conchoidal, Uneven
    Cleavage
    None