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Feathers around girdle

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goldenstar

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I have been looking online for SI1 stones in the 3ct range. I''ve noticed that the stones of this size and clarity frequently have several small feathers around the girdle. I''ve seen it so often that I''m wondering if I should go for a higher clarity in the size that I want.

Why do I often see feathers around the girdle of this size/clarity combination and is this something I should avoid for durability sake?
 

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Garry H (Cut Nut)

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Date: 12/13/2006 5:39:29 PM
Author:goldenstar
I have been looking online for SI1 stones in the 3ct range. I''ve noticed that the stones of this size and clarity frequently have several small feathers around the girdle. I''ve seen it so often that I''m wondering if I should go for a higher clarity in the size that I want.

Why do I often see feathers around the girdle of this size/clarity combination and is this something I should avoid for durability sake?
this shows bearding http://www.jewellerycatalogue.co.uk/diamonds/images/bearding.jpg

This is a by pproduct of the bruting or rondisting process and is usually only mentioned and not down graded for clarity.

It is not a problem for durability - if a stone has been treated so harshluy during bruting it is probably never ever likely to break.

But no bearding is nicer
 

kenny

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Paul, how is bearding avoided?

Don''t rush by pressing too hard on the polishing wheel?
Maintain the wheel in better condition?
Make sure the angle of the stone is correct as it is applied to the wheel?
Inquiring minds. . .

IF this is unanswerable because it is proprietary just say so.
I''ve heard if you are deciding between two otherwise similar stones bearding can help you decide since it is an indication of poor workmanship.
 

Paul-Antwerp

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Date: 12/14/2006 7:30:26 AM
Author: kenny
Paul, how is bearding avoided?

Don''t rush by pressing too hard on the polishing wheel?
Maintain the wheel in better condition?
Make sure the angle of the stone is correct as it is applied to the wheel?
Inquiring minds. . .

IF this is unanswerable because it is proprietary just say so.
I''ve heard if you are deciding between two otherwise similar stones bearding can help you decide since it is an indication of poor workmanship.
Bearding has nothing to do with polishing, it is a result of bad bruting.

I would not call it sloppy or poor workmanship, it is just really bad workmanship.
 

kenny

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Thanks Paul.
 

elmo

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Here''s the plot for something I''m thinking about having a look at. Almost all of the features shown are feathers. Are the ones in the girdle area how bearding as you''re describing would be plotted? See any warning signs other than needing to determine whether any of these are reflective and eye-visible?

feather-plot.jpg
 

strmrdr

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Date: 12/27/2006 6:14:31 PM
Author: elmo
Here''s the plot for something I''m thinking about having a look at. Almost all of the features shown are feathers. Are the ones in the girdle area how bearding as you''re describing would be plotted? See any warning signs other than needing to determine whether any of these are reflective and eye-visible?
has to be seen by a trusted expert in person.
bottom line!!!
 

elmo

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I hear you Strm. Seeing this plot made me think back two weeks to this thread and Garry's comment about durability, and Paul's about workmanship. BTW heard you were having surgery - hope you're doing well now.
 

kenny

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Ladies, wouldn't feathers around your girdle tickle your tummie?
 

JohnQuixote

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Haven''t there been such questions about brutal (bruted) girdles? :)

Bruting creates the face-up outline of the stone, using one diamond to grind against another on a lathe, rounding it into shape.

Kenny: Bearding can result from too much force, to much friction allowed to build up, rushing the job, etc.

Another image: http://www.bwsmigel.info/Lesson7/images.wl.7/girdle.beard.jpg
 

elmo

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That's funny John, and like what I was thinking, that if the plot is to scale and the feathers there are the result of bearding (east, south sides), that the effect was pretty "brutal"
. Nice pic from Barbara's site BTW. But this brings me back to what made me think about the original post - there are enough other feathers/fractures in the material in other locations I'm wondering whether those around the girdle actually resulted from bearding, or possibly something else. I'd probably need Kenny's microscope to post pics for analysis
.
 
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