Find your diamond
Find your jewelry
shape
carat
color
clarity

Help understanding Sarin report girdle numbers

Status
Not open for further replies. Please create a new topic or request for this thread to be opened.

grabinski

Rough_Rock
Joined
Jun 28, 2003
Messages
5
I have been reading numerous old posts on this forum for several weeks now, and I appreciate the help of everyone. Now I have a specific question about the diamond that I am considering:

Could someone please give me some advice on regarding the attached Sarin report? I am a little concerned that the girdle is too thin, but I don''t understand those numbers. Are they a minimum, a maximum, and an average % value? Any other comments regarding the cut of this diamond would be very much appreciated.

Thanks,
Jim

grabinski.jpg
 

elmo

Brilliant_Rock
Joined
Jun 18, 2003
Messages
1,160
You don't have to worry about the girdle being too thin on that one. The numbers mean that the thickness of the girdle valleys ranges from 1.2% to 2.6% of the stone's diameter. According to AGS, this can be between 'thin' to 'slightly thick' and still be 'ideal' (someone who has a reference can give exact %s but this is a little under 1% to a little under 3%). But from a consumer's standpoint, anything more than 'medium' in more than just a spot or two is dead weight
.

Assuming the Sarin and lab report agree, because of the 58% table this may be close but is not "ideal" proportions, so I hope the seller isn't charging the price of an ideal. It still stands a chance of being a really good looking stone.

You don't mention weight. For that diameter (6.2mm), I hope it's mid-high eighties. If it's low nineties, you'd be paying a premium for the price jump at 0.90 for no benefit whatsoever.
 

grabinski

Rough_Rock
Joined
Jun 28, 2003
Messages
5
Thank you Elmo. The weight is 0.90, so maybe the porportions are not quite right. It is H, SI1, and the price is $3600. Does anyone think that I would be paying too much since the diameter is small.

Thanks again everyone,
Jim
 

elmo

Brilliant_Rock
Joined
Jun 18, 2003
Messages
1,160
It's not that the proportions necessarily "aren't right", it's that the cutter met his objectives on that one
.
 

Giangi

Ideal_Rock
Joined
Jan 23, 2003
Messages
2,530
AGS GIRDLE GRADING:

Ext.Thin 0.00 to 0.08%
Very thin 0.09 to 0.50%
Thin 0.51 to 1.20% ---> AGS 0
Medium 1.21 to 1.70% ---> AGS 0
Sl.Thick 1.71 to 2.95% ---> AGS 0
Thick 2.96 to 4.20%
Very Thick 4.21 to 5.70%
Ext.Thick 5.71 % or more


 

DX Toronto

Rough_Rock
Joined
Jun 20, 2003
Messages
3
Hi Grabinski


This looks like a really great diamond. This looks like one of those AGS1 stones that will out perform a lot of AGS 0’s at the extremities of the AGS 0 specs

/www.pricescope.com/idealbb/images/smilies/3.gif[/img]>/www.pricescope.com/idealbb/images/smilies/3.gif[/img]>


Michael


Diamond Exchange Toronto

 

Rhino

Ideal_Rock
Trade
Joined
Mar 28, 2001
Messages
6,272
Just a note from your friendly neighborhood Rhino.


The girdle measurements commonly given on Sarin/OGI reports and AGS Reports are the girdle thickness at the points of the girdle knows as the "valleys". There are actually 3 areas around the perimeter of diamond where the girdle is measured. The other areas are the "halves" and also the "bezels". Girdles can vary greatly in their thickness at these other junctions, particularly the halves where the upper girdle facets meet. When upper girdle facets are cut to certain angles it can either flatter the stone (increasing contrast or light return, a positive factor) or it can also increase leakage in the diamond (a negative factor). To learn more about this and it's effect on the diamonds optics check out this page ... http://www.goodoldgold.com/the_girdle.htm and on our minor facets page I've updated some of the info regarding the upper girdles and their impact on optics. When the upper girdle facet angles are changed it alters the girdle thickness at the halves. http://www.goodoldgold.com/minor_facets.htm

I know I have more work to do on both of those pages but they make for interesting study.

Peace,
Rhino
 

Richard Sherwood

Ideal_Rock
Joined
Sep 25, 2002
Messages
4,924
Great work on your minor facets pages Rhino. As usual, you're on the cutting edge.

I tend to like the contrasting spots of leakage on each side of the arrow tips and upper girdle break points, versus the stones which have the minor facets "tweaked" to eliminate this leakage.

I think they enhance the stone by contributing to the light-dark-light-dark contrasting scintillation of the diamond, and make the light return areas more pronounced in comparison.

Contrast is definitely an important part of the equation. Some of the shallower stones have awesome light return, yet lack contrast. This makes for more of a "headlight" look, versus a "dancing of the facets" look.
 

elmo

Brilliant_Rock
Joined
Jun 18, 2003
Messages
1,160
Very interesting discussion on the "other" forum about this as long as you cut through the noise level and brand wars. It looked to me like one of the MSU researchers Serg might agree with you, Richard...a bit of randomness and leakage in the right places and amount possibly helps add some visual interest, maybe in the way that a small amount of some pretty funky aromas can make a great bottle of wine memorable
. For instance, the Richard Sherwoods and Dave Atlases of the wine world can often use the descriptors 'barnyardy', 'sweaty', and 'volatile' to describe a particuly fine bottle.
 

pricescope

Ideal_Rock
Joined
Dec 31, 1999
Messages
8,266
----------------
Very interesting discussion on the "other" forum about this as long as you cut through the noise level and brand wars.
----------------
Elmo, there is no crime in mentioning (or linking) any "other" forum here
 

elmo

Brilliant_Rock
Joined
Jun 18, 2003
Messages
1,160
----------------
On 6/29/2003 1:43:51 PM Richard Sherwood wrote:

"Volatile". I like that word. I'll have to work it in my diamond descriptions.

----------------
That's pretty funny
. I've seen "explosive" used enough times for diamonds, why not "volatile"? Just don't put them together the same sentence
.

I think with wine it's a reference to a fermentation byproduct other than alcohol that smells something akin to a highly aromatic organic solvent.
 

grabinski

Rough_Rock
Joined
Jun 28, 2003
Messages
5
Thanks again everyone. I think that I am going to buy this stone.

Rich,

Do you do verifications and appraisals? I live in Tampa, and I would like to drive down and commision you for verification and for an appraisal. The diamond is inscribed with the GIA number, so if I brought it to you already in the setting, or should I bring it loose and then take it to a jeweler to be set?

Jim
 

Richard Sherwood

Ideal_Rock
Joined
Sep 25, 2002
Messages
4,924
-----------
Do you do verifications and appraisals?
-----------

Yes. I'm an independent appraiser who does not buy or sell, but only appraises.

-----------
I live in Tampa, and I would like to drive down and
commision you for verification and for an
appraisal.
-----------

Great. Sounds like fun. A 0.90 would run $90 for verification and appraisal, and would take a little over an hour to do on a while-you-wait appointment basis. If the mounting is a diamond mounting, it will probably run $25 additional (or up to $45 for a complex diamond mounting).

-----------
The diamond is inscribed with the GIA number, so if
I brought it to you already in the setting, or
should I bring it loose and then take it to a
jeweler to be set?
-----------

It's always easier and more accurate to grade a stone when it's loose, but insurance companies like the stone to be appraised as mounted. A catch-22, if you will.

If you have the mounting, you could bring it and the stone down loose. I could appraise it loose, and then take a photo of it sitting in the mounting, and include the mounting in the appraisal.

If you decide to have it mounted before bringing it down, I could get some of the information off your cert that is difficult to get from a mounted stone.

Whatever is most convenient for you.

Thanks,
 
Status
Not open for further replies. Please create a new topic or request for this thread to be opened.
Be a part of the community It's free, join today!
    Radiant Ruby Cluster Ring
    Radiant Ruby Cluster Ring
    Recutting And Resetting A Heirloom
    Recutting And Resetting A Heirloom
    Princess Diana: Timeless Jewelry Every Woman Should Own
    Princess Diana: Timeless Jewelry Every Woman Should Own

Need Something Special?

Get a quote from multiple trusted and vetted jewelers.

Holloway Cut Advisor



Diamond Eye Candy

Click to view full-size image.
Top