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 Post subject: name of diamond cut with 9 corner table?
PostPosted: Thu Feb 15, 2018 3:16 pm 
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Hi there, I got this diamond that is cut like a brilliant however the table doesn't consist of two squares. It has 9 corners instead of 8. Does this cut have a name or is it just a special cut?


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Thu Feb 15, 2018 7:30 pm 
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Can you post a picture, please?
I'm unclear as to what you mean by the table having 2 squares. :|
Image


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Fri Feb 16, 2018 6:20 am 
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Image

The red lines are two squares at an angle from each other to form a star. The stone I have has a 9 corner star. The corners are evenly distributed.


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Fri Feb 16, 2018 2:12 pm 
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Oh. Quite right. :oops:
How would the 9 fold symmetry look?


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Sat Feb 17, 2018 11:25 am 
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Unless i'm counting wrong, that is a standard round brilliant. I can't see 9 stars anywher


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Sat Feb 17, 2018 5:59 pm 
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Just look for a facet diagram for a "9 main brilliant". That should also have 9 corners as you described.


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Sat Feb 17, 2018 11:47 pm 
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Steve, WOW! Is there anything you don't know?
9 fold symmetry? Definitely above my pay grade.


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Sat Feb 17, 2018 11:56 pm 
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Odd numbers of mains are reputed to have better performance. Robert Long has recently done a study, making odd symmetry designs for 96 index.


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Mon Feb 19, 2018 12:53 am 
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Do a search on facetdiagrams.org for FVS-134 for an example of a round stone with a 9-sided table. Is this what you have (the stable, not the rest of the design)? If so, a 9-sided, round brilliant should be easy enough to design.

Keith


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Fri Feb 23, 2018 3:30 pm 
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tfw wrote:
Do a search on facetdiagrams.org
Keith


I think I found it:
Image

If you follow the lines from corner to corner it goes back to where you started. 9 corners. What a cool stone. I had no luck making a sharp picture showcasing the geometry, have to find the right lighting setup.

Do people charge more for such cuts, is it a high end thing or more of a novelty?


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 Post subject: Re: name of diamond cut with 9 corner table?
PostPosted: Fri Feb 23, 2018 7:52 pm 
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Barbra Voltaire wrote:
Steve, WOW! Is there anything you don't know?
9 fold symmetry? Definitely above my pay grade.



There is so much I don't know that it boggles the mind.... :roll:


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