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[Details] Synthetic Diamonds ID


#1

Hi Jess,

Here are the different properties for synthetic diamonds
produced by

1) General Electric.
2) Sumitomo.
3) DeBeers.
  1. General Electric.

    -colour : yellow, near colourless and blue.
    -sizes : up to 1 carat.
    -crystal shapes : octahedra modified by a cube or a dodecahedron.
    -fluorescence to LW/UV : inert.
    -phosphorescence : for yellow none, for nearly blue and colourless
    strong yellow.
    -fluorescence X-Rays : for yellow none, for nearly colourless and blue
    strong yellow with a strong phosphorescence.
    -absortion spectrum : no sharp bands.
    -electrically conductive : for yellow none, for nearly colourless and
    blue yes.
    -INCLUSIONS : primary flux inclusions; dust of very fine white
    particles; some small nickel plates; and an obvious colour zoning in the
    yellows.
    -other :they are magnetic; some obvious metal inclusions.

  2. Sumitomo.

    -colour : yellow.
    -sizes : up to 2 carats.
    -crystal shapes : distorted octahedra that has been modified by a cube
    or /and a dodecahedron.
    -fluorescence LW/UV : inert.
    -fluorescence SW/UV : for yellow or green-yellow moderate to strong.
    -phosphorescence : none.
    -fluorescence, X-Rays : weak to moderate ,bluish white.
    -absorption spectrum : no sharp bands.
    -electrically conductive : no.
    -INCLUSIONS : vein-like of colourless areas; some black flux opaque
    material;and graining.
    -other : has a slight attraction to magnet and also obvious metallic
    inclusions.

  3. DeBeers.

    -colour : brownish and greenish-yellow.
    -sizes : crystals of up to 11 carats.
    -crystal shapes : distorted octahedra modified by a cube or a
    dodecahedron.
    -fluorescence LW/UV : none.
    -fluorescence SW/UV : for the yellow none; for the brown-yellow moderate
    to strong yellow; for the green-yellow a weak yellow.
    -phosphorescence : only for the green-yellow a weak yellow.
    -fluorescence X-Rays : for the brown-yellow a moderate dark yellow; for
    the yellow a stronger dark yellow; for the green-yellow a strong yellow
    with a strong phosphorescence.
    -absorption spectrum : no sharp bands.
    -electrically conductive : no.
    -INCLUSIONS : clouds of very small white-like pinpoints; larger metallic
    inclusions; a distintc colour zoning that is aligned with the internal
    graining.

The heat conductivity is just as similar as the one in natural
diamonds , as well are the specific gravity and the refractive
index.

I am hoping to provide you next week with info on detection
about the the method on Chemical Vapour Deposition (CVD).

I hope this does answer some of your question. Francoise.