Ruby (Lead-glass filled) Gemstone & Information | Gemopedia by JTV | Gemopedia™
Lead glass filled rubies have been filled through a process similar to "infilling" using lead glass. Performed at lower temperatures, this is a less durable treatment and should be treated gently, avoiding household and professional chemicals. This treatment improves clarity, color, durability, and may add weight through the filling of voids and fissures.
Orangy Red, Red, Purplish Red
Ruby-lead-glass-filled classificationCommonNameRuby (Lead-glass filled)SpeciesCorundumVarietyLead Glass Filled RubiesColorsOrangy Red, Red, Purplish RedAlternateNamesMahaleo RubyGemstoneGroupsKeySeparationsMagnification and RI, birefringence, pleochroismClassificationCommentsLead glass will be damaged with jeweler's torch or exposure to chemicals. Specific gravity can be increased to to the amount of lead glass in the stone.
Ruby-lead-glass-filled chemistry & crystallographyChemicalNamealuminum oxideChemicalFormulaAl2O3SynthesisCrystalSystemTrigonalChemistryClassificationOxideNatureNaturalCrystallinityCrystallineChemistryComments
Ruby-lead-glass-filled optical propertiesTransparencyTransparent - OpaqueDispersionStrength: moderate fire Value: 0.018OpticalCommentsRefractiveIndex1.762-1.77
Tolerance:(+0.009/-0.005)Birefringence0.008-0.01OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV:
LWUV:CCFReactionPleochroismDichroic, strong orangy red and purplish red
Ruby-lead-glass-filled characteristic physical propertiesHardness9CharacteristicCommentsStreakWhiteSpecificGravity3.95-4.1 Typical:4ToughnessPoorInclusionsLead glass filled rubies will show gas bubble sand color concentrations in fissures. Blue flash colors from the lead glass filling might be seen when viewing stone in dark field lighting.LusterSubAdamantineStabilityPoorFractureConchoidalCleavageNone