Opal Triplet Gemstone & Information | Gemopedia by JTV | Gemopedia™

Opal Triplet

Opal triplets combine natural opal with layers of other materials. A thin slice of natural opal is assembled between a base (usually of matrix, plastic, glass or other material) and a colorless top that protects the natural opal. On occasion, the bonding agent may account for the third layer. Opal triplets typically provide a more affordable alternative to natural, solid opal.

Colors

Variety Of Colors

  • Opal-triplet classification

    CommonName
    Opal Triplet
    Species
    Opal Triplet
    Variety
    Colors
    Variety Of Colors
    AlternateNames
    GemstoneGroups
    KeySeparations
    Appearance and magnification
    ClassificationComments
    The cap of the triplet can be made of colorless synthetic spinel, rock crystal quartz or glass. The RI of cap will help you distinguish the make up of the stone. The base of the stone can be made of potch opal, dyed black chalcedony, glass or other matrix materials.
  • Opal-triplet chemistry & crystallography

    ChemicalName
    ChemicalFormula
    Synthesis
    assembled
    CrystalSystem
    NA
    ChemistryClassification
    Nature
    Composite
    Crystallinity
    ChemistryComments
  • Opal-triplet optical properties

    Transparency
    Semitranslucent - Opaque
    Dispersion
    OpticalComments
    RefractiveIndex
    1.47-0
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR)
    Fluorescence
    SWUV:
    LWUV:
    CCFReaction
    Pleochroism
    None
  • Opal-triplet characteristic physical properties

    Hardness
    CharacteristicComments
    Streak
    SpecificGravity
    Toughness
    Inclusions
    In opal triplets look for assembled nature and glue layer. Look for straight separation planes to distinguish opal triplets from natural opal that contain a potch opal under layer. Stones might have areas of potch or matrix that lack play-of-color. Synthetic opal will have a more uniform play-of-color appearance. The base of the stones are sometimes glued using black cement to give the appearance of a black opal.
    Luster
    Vitreous
    Stability
    Fracture
    Cleavage
    None