Ruby (Synthetic - Flame Fusion) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Ruby (Synthetic - Flame Fusion)

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.

Colors

Slightly Orangy Red, Strong Red, Slightly Purplish Red

  • Ruby-synthetic-flame-fusion classification

    CommonName
    Ruby (Synthetic - Flame Fusion)
    Species
    Corundum
    Variety
    Flame-Fusion Synthetic Ruby
    Colors
    Slightly Orangy Red, Strong Red, Slightly Purplish Red
    AlternateNames
    Lab Created Ruby
    GemstoneGroups
    KeySeparations
    refractive index, birefringence, pleochroism, magnification with immersion and spectrum
    ClassificationComments
    Flame fusion ruby might show poor polish and they are typically cut to calibrated sizes and with be symmetrical.
  • Ruby-synthetic-flame-fusion chemistry & crystallography

    ChemicalName
    aluminum oxide
    ChemicalFormula
    Al2O3
    Synthesis
    flame fusion
    CrystalSystem
    Trigonal
    ChemistryClassification
    Oxide
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Ruby-synthetic-flame-fusion optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: moderate fire Value: 0.018
    OpticalComments
    RefractiveIndex
    1.762-1.77
    Tolerance:(+0.009/-0.005)
    Birefringence
    0.008-0.01
    OpticCharacter
    Uniaxial
    OpticSign
    Negative
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: strong red
    LWUV: moderate to strong red
    CCFReaction
    Pleochroism
    Dichroic, moderate to strong orangy red and purplish red
  • Ruby-synthetic-flame-fusion characteristic physical properties

    Hardness
    9
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.95-4.1 Typical:4
    Toughness
    Excellent
    Inclusions
    Stones may display face up pleochroism, 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.
    Luster
    SubAdamantine
    Stability
    Very Good
    Fracture
    Conchoidal
    Cleavage
    None