Hi Jess,
Here are the different properties for synthetic diamonds
produced by
1) General Electric.
2) Sumitomo.
3) DeBeers.
-
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. -
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. -
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.