Quartz (Synthetic) Gemstone & Information | Gemopedia by JTV | Gemopedia™

Quartz (Synthetic)

Synthetic quartz is created by a process called hydrothermal growth. Hydrothermally grown synthetic gems crystallize slowly out of a solution (a mix of water and dissolved elements) that has been exposed to heat and pressure similar to the conditions on Earth under which the natural gem mineral grows. 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

Purple, Medium To Light Pink, Light To Medium Blue, Yellow, Bi-Color, Colorless

  • Quartz-synthetic classification

    CommonName
    Quartz (Synthetic)
    Species
    Quartz
    Variety
    Synthetic Amethyst, Synthetic Citrine, Synthetic Ametrine, Synthetic Quartz
    Colors
    Purple, Medium To Light Pink, Light To Medium Blue, Yellow, Bi-Color, Colorless
    AlternateNames
    Synthetic Amethyst, Synthetic Citrine, Synthetic Ametrine, Synthetic Quartz
    GemstoneGroups
    KeySeparations
    refractive index, birefringence, optic character and optic figure, lack of inclusions. Cobalt spectra on blue variety.
    ClassificationComments
    It often takes advanced laboratory tests to tell synthetic from natural quartz. The presence of Brazil-law twinning used to be proof of natural origin but this is no longer true unless it is the colorless variety.
  • Quartz-synthetic chemistry & crystallography

    ChemicalName
    silicon dioxide (aka silica)
    ChemicalFormula
    SiO2
    Synthesis
    hydrothermal
    CrystalSystem
    Trigonal
    ChemistryClassification
    Silicate
    Nature
    Synthetic
    Crystallinity
    Crystalline
    ChemistryComments
  • Quartz-synthetic optical properties

    Transparency
    Transparent - Translucent
    Dispersion
    Strength: weak fire Value: 0.013
    OpticalComments
    RefractiveIndex
    1.544-1.553
    Tolerance:very constant
    Birefringence
    0.009
    OpticCharacter
    Uniaxial
    OpticSign
    Positive
    PolariscopeReaction
    Doubly Refractive (DR)
    Fluorescence
    SWUV: Inert
    LWUV: Inert
    CCFReaction
    blue: often appears pinkish
    Pleochroism
    Dichroic, unobservable to moderate, varying shades of body color
  • Quartz-synthetic characteristic physical properties

    Hardness
    7
    CharacteristicComments
    Streak
    White
    SpecificGravity
    2.64-2.69 Typical:2.66
    Toughness
    Good
    Inclusions
    Synthetic quartz is usually free of inclusions but some stones may show inclusions that resemble bread crumbs. Other possible inclusions are gas and liquid two phase nail head spicules and stain cracks. Color banding may be observed parallel to a seed plate as well as flame like twinning. The surface may also have a texture resembling cobblestones. Transparent pink quartz is rare in nature and the synthetic variety usually has eye-visible color banding. Unnatural blue color will be seen in blue synthetic quartz.
    Luster
    Vitreous
    Stability
    Good
    Fracture
    Conchoidal
    Cleavage
    None