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 Post subject: Information needed on DLC to rough diamonds
PostPosted: Mon Aug 27, 2012 6:48 pm 
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I am told that in several African countries people are offering DLC treated stones of different types as diamonds or rough diamonds with coloured DLC applied.

If DLC was applied to a rough stone what changes from the normal properties would I find to the dichroscope image?

If coloured DLC was applied to rough diamond what changes would I find to the dichroscope image?

I have read that DLC Tac has a higher hardness than Corundum but is it scratch resistant given the thin coating?

I have read that green and also blue rough stones are being offered. What colours are available in DLC?

Any info by the well informed would be appreciated. Alankay - Australia


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 Post subject: Re: Information needed on DLC to rough diamonds
PostPosted: Mon Sep 03, 2012 5:31 pm 
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Diamond like carbon (DLC) is amorphous carbon with a Mohs hardness near 9.5, possibly thermally conductive but also electrically conductive (diamond isn't electrically conductive, excepting IIb diamonds and also some black diamonds owing their color to graphite inclusions)

To my understanding DLC would appear transparent and colorless to the naked eye if the film is very thin, but a thick film would be opaque black (so I guess you can also get a grayish shade in between).

I've not heard of coloured DLC, but if this does exist I'm curious to hear more about it.

besides DLC films, synthetic CVD/PVD polycrystalline diamond films can also be applied (either to diamond or to diamond simulants), synthetic polycristalline diamond film wouldn't be electrically conductive unless doped with boron.
Synthetic polycrystalline diamond film can be made blue by boron doping.

another concern would be synthetic monocrystalline diamond overgrowth over a natural diamond to make it bigger, but I don't know if it is technically possible yet?


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