Synthetic Ruby Overgrowth On Natural Corundum Seed Gemstone & Information | Gemopedia by JTV | Gemopedia™

Synthetic Ruby Overgrowth On Natural Corundum Seed

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

  • Synthetic-ruby-overgrowth-on-natural-corundum-seed classification

    CommonName
    Synthetic Ruby Overgrowth On Natural Corundum Seed
    Species
    Corundum
    Variety
    Synthetic Ruby Overgrowth On Natural Corundum Seed
    Colors
    Orangy Red, Red, Purplish Red
    AlternateNames
    GemstoneGroups
    KeySeparations
    magnification with immersion and RI, birefringence
    ClassificationComments
    Stones will have OTL RI where the chromium rich overgrowth layer remains.
  • Synthetic-ruby-overgrowth-on-natural-corundum-seed chemistry & crystallography

    ChemicalName
    aluminum oxide
    ChemicalFormula
    Al2O3
    Synthesis
    overgrowth hydrothermal
    CrystalSystem
    Trigonal
    ChemistryClassification
    Oxide
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Synthetic-ruby-overgrowth-on-natural-corundum-seed optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: moderate fire Value: 0.018
    OpticalComments
    RefractiveIndex
    1.762-0
    Tolerance:(+0.009/-0.005)
    Birefringence
    0.008-0.01
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: inert
    LWUV: inert to weak red
    CCFReaction
    Pleochroism
    Unobservable
  • Synthetic-ruby-overgrowth-on-natural-corundum-seed characteristic physical properties

    Hardness
    9
    CharacteristicComments
    Streak
    SpecificGravity
    3.95-4.1 Typical:4
    Toughness
    Excellent
    Inclusions
    Color 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.
    Luster
    SubAdamantine
    Stability
    Very Good
    Fracture
    Conchoidal
    Cleavage
    None