Question - Please Help.

[Larry2004]

I purchased yesterday a GIA cerified diamond. However, the cert. does not tell me what is the quality of the cut (Ideal, Very Good, Good, etc.). Should I be worried?

Shape and Cutting Style....Round Brillant
Measurements...7.54 - 7.58 x 4.53
Weight.....1.53 carat
Depth....60.0%
Table....58%
Girdle....Thin to medium, faceted
Cutlet....none
Polish...Ex
Symmetry..Ex
Clarity Grade...VS1
Color Grade...F
Fluorescence...None

Thanks,

Larry

 

[strmrdr]

looks good so far but without the crown and pavilian angles cant say much.
But from what you posted it looks good.

If it looks good to you dont worry about it and enjoy :}

 

[valeria101]

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On 4/8/2004 9:14:17 PM Larry2004 wrote:

I purchased yesterday a GIA cerified diamond. However, the cert. does not tell me what is the quality of the cut (Ideal, Very Good, Good, etc.). Should I be worried?

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Only a bit. The numbers alreday present are within the range of the best cuts, but the info on GIA reports is not sufficient to give a full evaluation.

Some evaluation of the stone's optics would do that nicely (Ideal Scope or simmilar tests done by an appraiser).

On the spot, with no tools wahtsoever, you can lok for those harts and arrows. While you would need some device (H&A viewer) to see the details which tell the grades of H&A precission, you should be able to pick up the harts and (especially) arrows in difuse light.

All in all: there is little chance your stone is way out of line. Wether it comes close to ideal cut or H&A specifications... no idea.

 

[valeria101]

BTW. Soon enough GIA will include some evaluation of cut quality on their reports... In the meantime, you might want an appraisal.

 

[Nicrez]

Nor will GIA reports tell you cut...YET. They are working on it.

Without Sarin numbers, I can't quite plug it into the HCA, but I can say that with a 60 Depth and a 58 table, you have a pretty good sparkler on your hands! The percents on those alone, would give you a 1A rating on the AGA charts, so good job!

If you can get a Sarin report, or get the stone measured to include angles (or percents) of the crown and the pavillion, as well as the culet % that would give you a HCA score which in all honesty will just tell you, it probably has pretty good marks, as you may already know.

Usually the more optimal round stone with 60% depth, will ahve a 56 or 57% table, so your 58% table means that maybe instead of visually facing up as a 1.5 you stone may a ppear slightly larger? Either way, the further details could help unravel the mystery, but it seems like a fine stone to me!

 

[Larry2004]

Thank you guys. Just needed some other opinions, since I am obviously not an expert. I was going by the GIA cert, which looked good. But, I found out shortly afterwards, that GIA cert. alone is not sufficient.

Thanks again.

 

[valeria101]

Here's what I mean...

The chart below maps the predicatble optics of diamonds with the approx same specs as yours given various pavilion and crown angles (this is NOW to be found ont he Cut Adviser page here).

The more red and orange on the page, the better chance to have a brilliant stone with the respective depth and table. There's plenty here

 

[Nicrez]

awww....Ana! I thought this was one of your famous Photoshop skills at work!!! (although Leonid posted similar charts ealier)...I am always impressed by the graphic representations you post with your responses, as they are not only really well done (your models and 3D pics, but are always colorful and lovely (like the chart or the GEMS!)

Larry, as you will see, you can NEVER have enough info on your stone. As a diamond is so miute in it's details and the cutting process is so intricate, each facet and angle and percent change can make one stone look lovely and another look awful. That's just the inconsistancy of such unique little carbon bundles! (and we love them for it!)

 

[diamondsman]

the stone looks nice from the numbers,As long as it doesn't have cr angles greater tha 35%(which I don't think it does)under comments you've got a nice stone.
hope you got a good deal on it.

good luck

 

[aljdewey]

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On 4/8/2004 9:30:05 PM Nicrez wrote:





Without Sarin numbers, I can't quite plug it into the HCA, but I can say that with a 60 Depth and a 58 table, you have a pretty good sparkler on your hands. The percents on those alone, would give you a 1A rating on the AGA charts, so good job!----------------

Larry, please understand that depth and table are only SOME of the elements that comprise a 1A rating on a stone, and those cannot be taken alone to determine the rating of a stone on the AGA chart, either. Those particular measurements can fall within the 1A rating, but if the others don't as well, then the stone most assuredly will not be a 1A.

As an example, Mara's former stone had a depth and table that fell within range.....but the crown angle was so shallow and the pavilion angle so steep that it was rated an AGS 7 on the cut. It was a brilliant cut, but didn't have a lot of fire.

Nearly all the reputable vendors here have repeatedly commented that having the depth and table alone are not enough to determine that a given stone will be a sparkler. Yes, it's a great first step, but it's only half of the information, and half just isn't enough to give any meaningful feedback.

Can you get crown/pavilion angles? That would be helpful.