Sapphire (Synthetic - Flame Fusion) Gemstone & Information | Gemopedia by JTV | Gemopedia™
The flame fusion process for creating gems, also called the Verneuil process, is the most affordable and common synthesis method for producing corundum (ruby and sapphire) and spinel. Powdered chemicals (the building blocks of the gem) are dropped through a high-temperature flame. The molten powder repeatedly falls from the flame onto a rotating pedestal, creating a synthetic crystal, called a boule, which can later be faceted into a gemstone. Synthetic gems have the same chemical, optical, and physical properties of their natural counterparts, but are a more cost-effective alternative to a natural gem.
Light Violet-Blue, Blue, Strongly Green-Blue
Sapphire-synthetic-flame-fusion classificationCommonNameSapphire (Synthetic - Flame Fusion)SpeciesCorundumVarietyFlame-Fusion Synthetic SapphireColorsLight Violet-Blue, Blue, Strongly Green-BlueAlternateNamesLab Created SapphireGemstoneGroupsKeySeparationsrefractive index, birefringence, pleochroism, magnification with immersion and spectrumClassificationCommentsStones might show polishing marks and poor polish. The stones will tend to be cut in calibrated sizes and with be symmetrical.
Sapphire-synthetic-flame-fusion chemistry & crystallographyChemicalNamealuminum oxideChemicalFormulaAl2O3Synthesisflame fusionCrystalSystemTrigonalChemistryClassificationCarbonateNatureSyntheticCrystallinityCrystallineChemistryComments
Sapphire-synthetic-flame-fusion optical propertiesTransparencyTransparent - OpaqueDispersionStrength: moderate fire Value: 0.018OpticalCommentsRefractiveIndex1.762-1.77
Tolerance:(+0.009/-0.005)Birefringence0.008-0.01OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: weak to moderate chalky blue to blue-green to yellowish green
LWUV: inertCCFReactionPleochroismDichroic, moderate to strong, varying shades of body color
Sapphire-synthetic-flame-fusion characteristic physical propertiesHardness9CharacteristicCommentsStreakWhiteSpecificGravity3.95-4.1 Typical:4ToughnessExcellentInclusionsMight show face up color zoning, curved striae that crosses facet junctions and strings of gas bubbles that might be mistaken for needles. It might be possible to see Plato lines or twinning planes under magnification and immersion with polarized light. Sometimes heated with borax to created fingerprint like inclusions to mask curved striae. Stones might show colorless areas and uneven color distribution.LusterSubAdamantineStabilityVery GoodFractureConchoidalCleavageNone