recutting ?

[nycguy]

can someone please give me an estimate of how much weight i would have to lose to get a diamond with a <2 hca score (but not necessarily ags000)?

is it possible to sometimes just remove a little depth without changing anything else (thereby decreasing carat weight, but not decreasing diameter)? if so does this stone seem like a candidate for that?

carat: 1.2
6.81 x 6.86 x 4.17
table: 60
depth: 61

thanks!!!

 

[Garry H (Cut Nut)]

It probably only needs the pavilion repolishing to gain 80% of what ever can be acheived.

but this needs a complete analysis by an expert who can see the stone.
Try the appraisers who help out here - they all know good cutters and can supervise the process for you.

 

[nycguy]

thanks for the very quick response - but can you explain a little more what you mean by a "pavillion repolishing"? would that just be taking off depth and not effecting visual size? also, is there any way to estimate how much would come off, ie. would i still be above a carat?

in case it matters, i realized i forgot to mention that the current girdle is medium to slightly thick.

last but not least, what visual effect do you think i would see from shaving off some around the pavillion if i didn't change the 60% table at all? could i still expect more fire just by changing the depth?

thanks so much, i really appreciate your information.

 

[Colored Gemstone Nut]

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On 11/25/2003 11:24:15 PM nycguy wrote:





thanks for the very quick response - but can you explain a little more what you mean by a 'pavillion repolishing'? would that just be taking off depth and not effecting visual size? also, is there any way to estimate how much would come off, ie. would i still be above a carat?

in case it matters, i realized i forgot to mention that the current girdle is medium to slightly thick.

last but not least, what visual effect do you think i would see from shaving off some around the pavillion if i didn't change the 60% table at all? could i still expect more fire just by changing the depth?

thanks so much, i really appreciate your information.


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Hi NYC Guy,

A lot of the way in which a diamond will perform better visually is largely dependent on the crown & pav. angle. Repolishing the pav. would in affect change the crown/pav angle relationship in reflecting light entering the stone at the best critical angle in reflecting it back out the top.

Imagine that the pavillion facets act as mirrors reflecting the light entering the stone back out the top. When these "mirrors" are postioned wrong many different affects can accure which can either increase or decrease the stones overall performance.

As Garry points out it would be in your best interest to get an expert involved along with getting a full sarin report run on the stone and then a competent cutter can properly assess the correct way in cutting the stone to maximize the best results based on the current measurements with maximizing weight retention.....

 

[Garry H (Cut Nut)]

recutting the pav = bottom only might remove .02-.03cts and will be the least wt loss.

You lose 10% of value dropping under 1.2ct.
Recutting the crown = much bigger wt losses, and more cost.
Most symmetry problems exist in the pavilion and can be fixed there.

 

[nycguy]

thanks for the info. I think i'd be inclined to go just with the pavillion work if that would make a real difference (even though table would be the same?).

i like the stone already, the one problem it may have is a slight nail head, but i dont know if i'm just over analyzing the stone after reading too many of these posts. does it appear from the numbers that this stone could have a nailhead problem or am i crazy?

 

[Garry H (Cut Nut)]

give me more specs - girdle culet....

 

[Garry H (Cut Nut)]

From your Girdle thickness somewhere else

It is likely that the crown is a little steep.
If so you may be able to repolish the crown only and get around 56% table with the same crown height - but this will probably take off 2 to 3 times more weight than tweaking the pavilion.
The nail head effect is more likely the ring of darkness just inside the table from leakage.

 

[nycguy]

i'm sorry, but i'm not sure what you mean by "From your Girdle thickness somewhere else"?

the girdle is medium -to slightly thick and the cutlet is none.

is the analysis the same given these facts? (ie. re-polishing the pavillion still a good option?) could you tell me visually what the difference would be between what i have now, what i'd have if i polished the pavillion and what difference re-doing the table & crown would be? do you still think that repolishing the pavilion would be the most impt change to make?

thanks so much i appreciate all the advice - i don't know where i'd learn about any of this stuff otherwise.

 

[Colored Gemstone Nut]

NYC Guy,






Garry was trying to outline that most symettry problems occur in the pavillion...Now given your situation I think he was outlining maximizing visual impact in regards to retaining as much weight because there are certain carat weight increments which suffer a percentage in the overall value due to the loss of initial weight in re-cutting..

is the analysis the same given these facts? (ie. re-polishing the pavillion still a good option?) could you tell me visually what the difference would be between what i have now, what i'd have if i polished the pavillion and what difference re-doing the table & crown would be? do you still think that repolishing the pavilion would be the most impt change to make?

Now if you want to maximize visual impact then your best option would be getting the stone recut to Super-Ideal proportions. This would involve recutting your stone which would have the greatest variation on weight loss vs. just getting the pav. repolished..




Super Ideal proportions are stunning, it is just going to be up to you if you want more weight loss for Super-Ideal proportions or less weight loss in getting the pav. repolished....




I once was exchanging emails with Richard from Eightstar and he stated when re-cutting diamonds to Ideal proportions they preferred stones with larger tables.. I think you have a good candidate for recutting on whatever you decide doing..../idealbb/images/smilies/wavey.gif

 

[Colored Gemstone Nut]

Hey again NYC,




If you did decide to get your stone cut to ideal proportions it would suffer the initial percentage drop in regards to the weight loss, but would be off-set a little by gaining value for the extreme measures taken to the stone regarding it's cut quality. 18 % weight loss results in dropping your overall carat weight under a carat...vs. a 16% weight loss in re-cutting which would keep you over the carat mark...




I would advise you to talk to an experienced cutter about options which would best maximize weight retention in regards to maximizing your stone visually. Because totally recutting your stone might put you under the carat mark you have some things to consider....




Paul-Antwerp frequents this board and I believe is familiar with re-cutting or you might want to contact Eightstar and see if they can give you feedback..There are many vendors who work with cutting houses who might be able to put you in touch with a cutter also...