Diamond Gemstone & Information | Gemopedia by JTV | Gemopedia™

Diamond

Ahh, diamonds. Everyone knows what diamonds are, but most might not realize what they once were--chunks of dark, nondescript carbon similar to charcoal, roasting and rumbling around deep within the earth. Fortunately, through eruptions and other harsh works of Mother Nature, diamonds eventually find their way to the surface for man to find, cut, polish, and enjoy. Talk about an ugly duckling turning into a swan! Named from the Greek word adamas, meaning "unconquerable", diamonds are renowned for their impeccable hardness and stellar brilliance and the birthstone for those born in April.

Colors

Colorless, Light Yellow, Yellow, Brown, Brownish Yellow, Orange, Light Yellowish Green, Dark Bluish Green, Pale To Deep Blue, Pale To Deep Green-Blue, Pale Green, Violet, Purple, Purple-Pink, Purplish Pink, Pink,Orangy Pink, Brownish Pink, Red, Gray, Black

  • Diamond classification

    CommonName
    Diamond
    Species
    Diamond
    Variety
    Colors
    Colorless, Light Yellow, Yellow, Brown, Brownish Yellow, Orange, Light Yellowish Green, Dark Bluish Green, Pale To Deep Blue, Pale To Deep Green-Blue, Pale Green, Violet, Purple, Purple-Pink, Purplish Pink, Pink,Orangy Pink, Brownish Pink, Red, Gray, Black
    AlternateNames
    GemstoneGroups
    KeySeparations
    polish luster, OTL RI, SR nature, magnification, positive reaction to diamond tester. Weak to strong ADR sometimes with parallel or cross-hatched patterns.
    ClassificationComments
    No see-through effect.Type IIb blue diamonds are electrically conductive.
  • Diamond chemistry & crystallography

    ChemicalName
    carbon
    ChemicalFormula
    C
    Synthesis
    CrystalSystem
    Cubic
    ChemistryClassification
    Native Element
    Nature
    Natural
    Crystallinity
    Crystalline
    ChemistryComments
  • Diamond optical properties

    Transparency
    Transparent - Opaque
    Dispersion
    Strength: moderate fire Value: 0.044
    OpticalComments
    RefractiveIndex
    Over the Limit 2.417-2.417
    Birefringence
    0-0
    OpticCharacter
    NA
    OpticSign
    NA
    PolariscopeReaction
    Singly Refractive (SR) With ADR
    Fluorescence
    SWUV: Colorless: commonly inert or weak to strong blue but could be any color;Occasional phosphorescence of 30 seconds or less.Red stones: Inert to faint blue.Red Type II stones: inert to medium to strong orange.Blue Type IIb: rarely weak red to orange-red, occasionally blue to greenish blue and phosphorescence is blue to green and occasionally red to orange red.Blue Type IIa: sometimes weak to strong blue, greenish blue, green, yellow or orange.Orange, yellow and brown stones: Inert to faint blue.Gray or black stones: Inert to strong blue is usual but can be any color.
    LWUV: Colorless: commonly inert or weak to strong blue but could be any color, generally a stronger reaction than under SWUV; Occasional phosphorescence of 30 seconds or less. Red Stones: inert to medium to strong blue.Red Type II stones: inert to medium to strong orange.Blue Type IIb: Inert.Blue Type IIa: sometimes weak to strong blue, greenish blue, green, yellow or orange.Orange, yellow or brown stones: inert, faint to moderate to strong blue.Gray or black stones: Inert to strong blue is usual but can be any color.
    CCFReaction
    Pleochroism
    None
  • Diamond characteristic physical properties

    Hardness
    10
    CharacteristicComments
    Streak
    White
    SpecificGravity
    3.5-3.53 Range:+/-0.10 Typical:3.52
    Toughness
    Good
    Inclusions
    Diamonds can have naturals, naturals with trigons, bruted girdle surface if not faceted, bearding, sharp facet junctions, angular mineral inclusions, parallel growth marks, color zoning, internal graining. Natural pink diamonds show strong strain patterns when view using magnification and polarized light. Red stones often have uneven parallel bands of red or pink and blue stones have blue and colorless zones. Yellow stones might have yellow and brown graining parallel to octahedral crystal faces and might form a cross hatch pattern. Blue Type IIb diamonds are most often free of mineral inclusions, but sometimes can have opaque black inclusions; whiteish transparent graining. Blue Type Ia and IIa diamonds might display color zoning near can be located near surface of the stone close to radiation stains. Green stones often have large naturals because the color is sometimes confined to the surface due to natural radiation staining. Yellow or orange stones might blotchy yellow color zones that are darker at the center and have polish lines that are never oriented the same way on adjacent facets.
    Luster
    Adamantine
    Stability
    Excellent
    Fracture
    Step-Like
    Cleavage
    Perfect, in four directions