YAG (yttrium aluminum garnet) Gemstone & Information | Gemopedia by JTV | Gemopedia™
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.
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 classificationCommonNameYAG (yttrium aluminum garnet)SpeciesYAGVarietyColorsColorless, Medium To Dark Bluish Green Through Yellowish Green, Medium To Dark Blue, Pink, Light To Dark Purplish Red, Orange, Yellow, PurpleAlternateNamesYttrium 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 GarnetGemstoneGroupsKeySeparationsNegative 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.ClassificationCommentsMisnomers: 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 & crystallographyChemicalNameChemicalFormulaY3AL5O12SynthesisCzochralski pulled or flux growthCrystalSystemCubicChemistryClassificationNatureSyntheticCrystallinityCrystallineChemistryComments
Yag-yttrium-aluminum-garnet optical propertiesTransparencyTransparentDispersionStrength: weak fire Value: 0.028OpticalCommentsRefractiveIndexOver The Limit 1.833-1.833
Tolerance:(+0.010/-0.010)BirefringenceOpticCharacterNAOpticSignNAPolariscopeReactionSingly Refractive (SR)FluorescenceSWUV: Variable
LWUV: VariableCCFReactionGreen: strong redPleochroismNone
Yag-yttrium-aluminum-garnet characteristic physical propertiesHardness8-8.5CharacteristicCommentsStreakSpecificGravity4.5-4.6 Typical:4.5ToughnessGoodInclusionsYAG 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.LusterSubAdamantineStabilityFractureConchoidal, UnevenCleavageNone