Synthetic Ruby Overgrowth On Natural Corundum Seed Gemstone & Information | Gemopedia by JTV | Gemopedia™
Synthetic refers to a man-made material with a natural counterpart that shares the same (or nearly identical) chemical, optical, and physical properties. Synthetic ruby may be created in a laboratory process that involves coating a natural corundum seed with feed material. During the process, a layer by layer grown occurs on the seed crystal.
Colors
Orangy Red, Red, Purplish Red
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Synthetic-ruby-overgrowth-on-natural-corundum-seed classification
CommonNameSynthetic Ruby Overgrowth On Natural Corundum SeedSpeciesCorundumVarietySynthetic Ruby Overgrowth On Natural Corundum SeedColorsOrangy Red, Red, Purplish RedAlternateNamesGemstoneGroupsKeySeparationsmagnification with immersion and RI, birefringenceClassificationCommentsStones will have OTL RI where the chromium rich overgrowth layer remains. -
Synthetic-ruby-overgrowth-on-natural-corundum-seed chemistry & crystallography
ChemicalNamealuminum oxideChemicalFormulaAl2O3Synthesisovergrowth hydrothermalCrystalSystemTrigonalChemistryClassificationOxideNatureSyntheticCrystallinityCrystallineChemistryComments -
Synthetic-ruby-overgrowth-on-natural-corundum-seed optical properties
TransparencyTransparent - OpaqueDispersionStrength: moderate fire Value: 0.018OpticalCommentsRefractiveIndex1.762-0
Tolerance:(+0.009/-0.005)Birefringence0.008-0.01OpticCharacterUniaxialOpticSignNegativePolariscopeReactionDoubly Refractive (DR)FluorescenceSWUV: inert
LWUV: inert to weak redCCFReactionPleochroismUnobservable -
Synthetic-ruby-overgrowth-on-natural-corundum-seed characteristic physical properties
Hardness9CharacteristicCommentsStreakSpecificGravity3.95-4.1 Typical:4ToughnessExcellentInclusionsColor on these stones is strong table up but patchy on the pavilion when viewed on a white piece of paper. The stones have wavy growth that can appear step like or crystalline. One might be able to see facet junctions of the original stone underneath the overgrowth layer that do not match the facets of the outer layer. Stones will probably show uneven color due to removal or the overgrowth layer. They have a mottled or roiled texture when stone is viewed with immersion.LusterSubAdamantineStabilityVery GoodFractureConchoidalCleavageNone