Surface Graining

[pyramid]

Would a diamond with lots of surface graining automatically show signs of strain under a polariscope? I cannot see any internal graining with the loupe and the diamond is beautiful just has surface graining all over it. Only notice the surface graining with a loupe.

 

[pyramid]

PS. I know lots of experts do not believe strain has any impact on a cut diamond but I am just really wondering if a diamond with surface graining will show all those different colours in the polariscope?

 

[Garry H (Cut Nut)]

Most probably

It is pretty isn't it

 

[pyramid]

 

[pyramid]

whoops wrong smiley

 

[pyramid]

If it is surface polish lines would the stone still show up under the polariscope with various colours showing strain?

 

[Garry H (Cut Nut)]

If you read my post with an open mind P you will see that is what i said

Now go to bed

 

[pyramid]

Garry, maybe I need to have a more open mind as I don't get what you mean. Garry Roskin's book (in my understanding) is saying that Surface Grain lines and Polish lines are a different thing.


p.s. I had a nice sleep

 

[Garry H (Cut Nut)]

Perhaps we can get you to go back now P?
It is nearly mid day there

You ask about a stone that has lots of surface graining - naturally it will have polish lines. The polish lines are surface grain lines from twinning, and twinning causes anomolous polarization.

I wish someone who loves you would steal and hide any form of magnification so that you can only see big things.
Enough small detail my darling

 

[pyramid]

No I am not looking at a diamond. I was wondering about just polish lines with no graining present. The grain lines was a diamond I had looked at.

Actually, I have locked away my loupe and don't use it now. The graining I saw at a jewellers.

It is 9am here now.

 

[valeria101]

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On 5/10/2004 3:45:27 AM pyramid wrote:



Roskin's book (in my understanding) is saying that Surface Grain lines and Polish lines are a different thing.

----------------

Yeah... Is this right ?

surface gain lines = some internal feature breaking surface
polish lines = imperfect polishing that leaves marks behind.

These two look very different, although, one could cause another - imperfections on a diamond's surface could make polishing difficult and hence imperfect.

Does the book you cite have any pictures? there are some for each type of flaw on PS and GOG... and elsewhere onlyne for sure. If you ever want to unlock the loupe and seek imperfect polish and graining out, look at soe champagne diamonds - for some reason, those tend to have lots of it and nicely colored for all to see

 

[pyramid]

Yeah, Valeria101 that is what CutNut was saying that surface graining would cause the polish lines. I did not explain though that I was asking about them separately under the polariscope.

Yes Gary Roskin's book has wonderful magnified pictures. I like the champagne and brown diamonds also but cannot buy them just now as I am saving for the big 1 carat diamond which I will get in a few years. Anyway, I have banned myself from using the loupe a few months ago

I have a photo I saved from this site by Serg on this link

https://www.pricescope.com/community/threads/is-it-polishing-lines.10238/

and this is what got me wondering if those lines would cause bright colours under the polariscope.

 

[valeria101]

Oh... I never read those posts carefully enough!

And I suppose that sloppy polish can definitely leave those lines with no help from the diamond structure.

Now Pyramid, do you know a recipe for cutting down PS posts? Even though I definitely have time for this, something feels wrong

 

[pyramid]

valeria101, I am going to have a rest from pricescope and come back maybe when I am nearer to buying my upgrade engagement ring.

 

[mdx]

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On 5/9/2004 3:18:48 PM pyramid wrote:

Would a diamond with lots of surface graining automatically show signs of strain under a polariscope? I cannot see any internal graining with the loupe and the diamond is beautiful just has surface graining all over it. Only notice the surface graining with a loupe.----------------

Hi Pyramid
You can have tension fields in both Twinning planes and Growth planes and these would be more visible in polarized light. I have also seen both without discernable tension

Johan

 

[pyramid]

Thanks CutNut, valeria101 and mdx.