Plastic Gemstone & Information | Gemopedia by JTV | Gemopedia™

Plastic

Plastic is sometimes employed as a gemstone simulant, but can also be appreciated entirely upon its own merits, especially when formed with a high level of artistry. Plastics are typically easy to identify, due to a variety of factors such as specific gravity, gas bubbles, hardness, concave facets, flow lines and marks left from the molding process. While no single property is definitive, a combination of three or four will normally allow you to identify the material.

Colors

Variety Of Colors

  • Plastic classification

    CommonName
    Plastic
    Species
    NA
    Variety
    Colors
    Variety Of Colors
    AlternateNames
    Lucite, Plexiglas, Celluloid, Bakelite And Acrylic
    GemstoneGroups
    KeySeparations
    RI, magnification, SG; Destructive: Acrid smell when hot point test is used
    ClassificationComments
    Most plastic stones will likely sink in a saturated salt solution. Items will feel warm to the touch when compared to natural gem materials. Plastic is widely used to imitate a variety of materials.
  • Plastic chemistry & crystallography

    ChemicalName
    polymer
    ChemicalFormula
    Synthesis
    CrystalSystem
    NA
    ChemistryClassification
    Nature
    Simulant
    Crystallinity
    Amorphous
    ChemistryComments
  • Plastic optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: none
    OpticalComments
    RefractiveIndex
    1.46-1.55
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Pleochroism
    None
  • Plastic characteristic physical properties

    Hardness
    1.5-3
    CharacteristicComments
    Streak
    SpecificGravity
    1.05-1.55
    Toughness
    Fair
    Inclusions
    Mold marks, concave facets with a pitted surface that looks like an orange peel. Sometimes flow lines and gas bubbles can be seen.
    Luster
    Vitreous
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    None