YAG (yttrium aluminum garnet) Gemstone & Information | Gemopedia by JTV | Gemopedia™

YAG (yttrium aluminum garnet)

Yttrium aluminum garnet (YAG) is a lab created gem first developed in the 1950's. Its primary application was in optics and laser technology, but it turned out to be a convincing diamond simulant. Although YAG has garnet in its name, it is not related to garnet; it is an artificial gemstone with no natural counterpart.

Colors

Colorless, Medium To Dark Bluish Green Through Yellowish Green, Medium To Dark Blue, Pink, Light To Dark Purplish Red, Orange, Yellow, Purple

  • Yag-yttrium-aluminum-garnet classification

    CommonName
    YAG (yttrium aluminum garnet)
    Species
    YAG
    Variety
    Colors
    Colorless, Medium To Dark Bluish Green Through Yellowish Green, Medium To Dark Blue, Pink, Light To Dark Purplish Red, Orange, Yellow, Purple
    AlternateNames
    Yttrium Aluminum Garnet, Alexite, Amatite, Circolite, Dia-Bud, Diamite, Diamogem, Diamonair, Diamone, Diamonite, Diamondite, Diamonte, Di'yag, Geminair, Gemonair, Kimberly, Linde Simulated Diamond, Nier-Gem, Regalair, Replique, Somerset, Triamond, YAIG, Yttrium Garnet
    GemstoneGroups
    KeySeparations
    Negative reaction to diamond tester, OTL RI, lack of doubling, fluorescence, SG and pavilion flash.Well cut colorless stones will show mostly blue to violet pavilion flash. Stones show strong see through effect.
    ClassificationComments
    Misnomers: synthetic diamond; green: synthetic demantoid. Coloring elements: green (chromium), blue (cobalt), red (manganese), yellow (titanium), purple (neodymium), pink, and orange. Has no natural counterpart.
  • Yag-yttrium-aluminum-garnet chemistry & crystallography

    ChemicalName
    ChemicalFormula
    Y3AL5O12
    Synthesis
    Czochralski pulled or flux growth
    CrystalSystem
    Cubic
    ChemistryClassification
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Yag-yttrium-aluminum-garnet optical properties

    Transparency
    Transparent
    Dispersion
    Strength: weak fire Value: 0.028
    OpticalComments
    RefractiveIndex
    Over The Limit 1.833-1.833
    Tolerance:(+0.010/-0.010)
    Birefringence
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR)
    Fluorescence
    SWUV: Variable
    LWUV: Variable
    CCFReaction
    Green: strong red
    Pleochroism
    None
  • Yag-yttrium-aluminum-garnet characteristic physical properties

    Hardness
    8-8.5
    CharacteristicComments
    Streak
    SpecificGravity
    4.5-4.6 Typical:4.5
    Toughness
    Good
    Inclusions
    YAG generally is inclusion free but some might have gas bubbles. Pulled material might show curved striae. Green stones might show red flashes when viewed in transmitted light. If the stone is created using the flux method might show tiny grains, white flux or feathers.
    Luster
    SubAdamantine
    Stability
    Fracture
    Conchoidal, Uneven
    Cleavage
    None