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how important: GIA "cut grade" and extra facet?


daveCA
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Considering purchase of a 1.5 carat brilliant-cut, round stone.

 

Stone has following specs:

 

Per AGA tables, all proportions are 1A except:

pavilion height & girdle are 1B

crown angle is 2A

 

GIA-rated color = F

GIA-rated clarity = VS2

polish = excellent

symmetry = very good

no culet

Holloway score = 1.0

 

Only two things concern me about the stone:

1. GIA "cut grade" = good

2. "extra facet" flaw on the outer perimeter of the stone as viewed from bottom

 

How important are these?

 

The "FacetWare" software on the GIA website graded the cut as only "good". The program generated the rating based on the stone's proportions, culet size, polish, and symmetry. I'm concerned that the stone's proportions may not be the best, since GIA cut grade tables indicate the stone would score either VG or E based on culet, polish, and symmetry alone.

 

Am I splitting hairs on the proportions (especially since AGA & Holloway indicate relatively good proportions)? Is the extra facet a big deal?

 

Thanks for any feedback.

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  • 2 weeks later...

HI Dave!

I'm not familiar with 1A, 2B etc...

I have not found that any of these "systems" have any validity whatsoever.

I mean, we're not talking about a statistic, we're talking about a diamond.

I LOVE the way GIA's cut grade is inclusive. It includes both traditional "Ideal" cuts, as well as really well cut diamonds of slighjtly different proportions.

Still, I would not use GIA's cut grade, by itself, to buy a diamond.

 

You need to be able to at least see some good photos to give you an idea.

A seller that has the diamond can give you a far better idea of what the diamond looks like.

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The Holloway Cut Advisor measures 17 of the 58 facets that comprise the round brilliant shape. Partial info at best.

 

Garry H. himself incessantly reiterates that his Advisor should not be used as a picking tool but as a "reject tool to separate the wheat from the chaff.

 

This could be a very nice visually appealing diamond or a dog. "Numbers" alone won't tell you this. Sounds like you're shopping with an Internet Vendor.

 

You need pictures.

 

Ask for them.

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