Type-C Jade Gemstone & Information | Gemopedia by JTV | Gemopedia™

Type-C Jade

The term, "type-C jade," refers to the enhancement that a jadeite jade gem has undergone. Inthis case, the jadeite has been bleached to remove unattractive brown staining, then stabilized witha polymer resin, and finally dyed to improve or change its color. When a jadeite gem is bleached and stabilized, but not dyed, it is called "type-B." Untreated jadeite, that may or not have had wax applied to its surface, is called, "type-A."

Colors

Almost Any Color

  • Type-c-jade classification

    CommonName
    Type-C Jade
    Species
    Jadeite
    Variety
    Dyed, Bleach and Impregnated Jadeite
    Colors
    Almost Any Color
    AlternateNames
    Type-C Jadeite, Type-C Jade, Dyed, Bleach And Impregnated Jadeite
    GemstoneGroups
    KeySeparations
    Appearance, RI, spectrum, SG and magnification. The detection of dyes might require advanced lab testing. Scratch test can be used but is destructive.
    ClassificationComments
    Dyed jadeite stones will have a broad band in the red area of the spectrum and natural jadeite colored with chrome will only have 3 lines in the yellow, orange and red.
  • Type-c-jade chemistry & crystallography

    ChemicalName
    sodium aluminum silicate
    ChemicalFormula
    NaAlSi2O6
    Synthesis
    CrystalSystem
    Monoclinic
    ChemistryClassification
    Silicate
    Nature
    Natural
    Crystallinity
    Polycrystalline
    ChemistryComments
  • Type-c-jade optical properties

    Transparency
    Semitransparent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.666-1.68
    Tolerance:(+0.008/-0.008)
    Birefringence
    OpticCharacter
    OpticSign
    PolariscopeReaction
    Singly Refractive (SR)
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Pleochroism
    Unobservable
  • Type-c-jade characteristic physical properties

    Hardness
    6.5-7
    CharacteristicComments
    Streak
    SpecificGravity
    3.25-3.4 Typical:3.34
    Toughness
    Excellent
    Inclusions
    Dyed jadeite is usually unevenly colored but sometimes you might be able to see dye concentrations under magnification. Type C jadeite has been bleached with acid to remove staining then dyed and often been impregnated with wax or polymers. Hopefully the dye is apparent in surface reaching cracks. Be careful not to confuse this with the color streaks in natural jadeite. It will show etch boundaries between the individual crystal grains. Advanced lab testing is usually required to detect polymer impregnation.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Splintery, Granular
    Cleavage
    None