Twinning Wisp

[BobR]

Hi All
Im in the process of buying a 3 stone pendant for my wife, All stones are GIA certs, (but as I bought from virtual inventory I haven''t seen them yet).
One of them is 0.35 F Si1 Ex/VG/VG. Its only listed inclusion is a twinning wisp.
Could this be a problem as the grademaker for the stone, and how likely is it to be visible to average naked eye? (the other 2 both have feather/cloud as description which seems to be very common for Si1 stones). The jeweller says all 3 are eyeclean.
thanks for any feedback!!
Bob

 

[FB.]

In relatively small stones, I doubt that it will be a problem.
The only way to be sure is to ask the seller.

 

[Lorelei]

Date: 11/6/2009 4:20:29 PM
Author:BobR
Hi All
Im in the process of buying a 3 stone pendant for my wife, All stones are GIA certs, (but as I bought from virtual inventory I haven''t seen them yet).
One of them is 0.35 F Si1 Ex/VG/VG. Its only listed inclusion is a twinning wisp.
Could this be a problem as the grademaker for the stone, and how likely is it to be visible to average naked eye? (the other 2 both have feather/cloud as description which seems to be very common for Si1 stones). The jeweller says all 3 are eyeclean.
thanks for any feedback!!
Bob

Hi Bob

Twinning wisps aren''t normally an issue, but check with the vendor to be sure. Also with the diamonds that have clouds as grade setters ( if they are drawn on the report) check that these aren''t impacting brilliance, this is rare but best to check.

 

[BobR]

Date: 11/6/2009 4:22:41 PM
Author: Lorelei

Date: 11/6/2009 4:20:29 PM
Author:BobR
Hi All
Im in the process of buying a 3 stone pendant for my wife, All stones are GIA certs, (but as I bought from virtual inventory I haven''t seen them yet).
One of them is 0.35 F Si1 Ex/VG/VG. Its only listed inclusion is a twinning wisp.
Could this be a problem as the grademaker for the stone, and how likely is it to be visible to average naked eye? (the other 2 both have feather/cloud as description which seems to be very common for Si1 stones). The jeweller says all 3 are eyeclean.
thanks for any feedback!!
Bob

Hi Bob

Twinning wisps aren''t normally an issue, but check with the vendor to be sure. Also with the diamonds that have clouds as grade setters ( if they are drawn on the report) check that these aren''t impacting brilliance, this is rare but best to check.

Thanks FB / Lorelei

The other 2 stones are 0.5/0.65 so won''t have any maps on the cert. So I guess its wait and see (next week sometime).
All 3 are FSi1
Bob

 

[BobR]

Also just remembered reading somwhere that twinning wisps are normallly found in low quality rough!! Does anyone have any comments - or did I maybe dream(nightmare) this??
thx
Bob

 

[Lorelei]

Most welcome!

Did you want to post links to the GIA reports or all the info on each so we can help you judge the cuts?

 

[FB.]

While the stone may well have come from lower quality rough, the important part is how well it has been cut. Many "fancy" shapes also come from lower quality rough and you will see many twinning wisps in pear shaped diamonds. But that doesn''t stop me buying pear shaped stones just because they might have come from low quality rough. After all, what matters to the consumer is the cut, colour and clarity.

Although I am not a fan of twinning wisps and don''t have any such stones, I would not generally let it prevent me from buying a stone that otherwise met all my requirements - and, in fact, for several weeks, I have been keeping a close watch of a 1ct stone that interests me and it contains some twinning wisps, together with internal and surface graining (which I also don''t much like).

 

[kenny]

Date: 11/6/2009 4:22:21 PM
Author: FB.
In relatively small stones, I doubt that it will be a problem.

The only way to be sure is to ask the seller.

Wouldn''t the seller be the worst person to ask?

 

[BobR]

Lorelei
The 3 stones have the following specs:-
I know 1 is borderline and the other 2 are steep/deeps

Ct 0.65 0.5 0.35
Colour/Clarity FSI1 FSI1 FSI1
Cut Ex Ex Ex
Symm Ex Ex VG
Polish Ex Ex VG
Table 57 57 57
Depth 61.3 61.9 61.8
Girdle Th/Med 3.0 Th/Med 3.0 Thn/Med 3.0
CA/Height 35/15 34.5/15 36/15.5
PA/Depth 41/43 41.4/44 41/43.5
Star/Lower Facet 55/75 55/75 50/80
(from playing with a cut analyser I found online it seems that the 2 PA''s of 41 may, in fact be 40.9)
My overriding concern is that the 3 stones have the same make/look and hopefully the matching table/depth and girdles will do that.

I will be able to compare the stones directly to some FSI1 earrings which are 3 stone studs
The stones are a mishmash in terms of table and depth, which Ive managed to avoid for the pendant, but apart from the fact that most of them have polish/symettry below vg, so miss the top grade, from a proportion perspective 4 are GIA Ex/AGS Ideal
0.27 ct with table / ca/pa
1) 60/32/41.2
2) 55/32.5/41,4
3) 61/33.5/40.6 (VG only)
4) 61/36.5/40.8 (vg only)
5) 58/33.5/41
6) 55/33.5/41

To my eye the best performing stone is no 2

Anyway I will have ''master stones'' to see if I have any visible (to my wife and I) degradation from the steep deeps.

As I think has been said on other threads we are not as well served in the UK as US in terms of high end/reasonable priced (online) vendors, however this one seems closest to the bill and the pendant price is competitive with buying premium stones from US, without the hassle of worrying about returns/VAT reclaim/finding someone reliable to make pendant and set stones etc.
Anyway hope I haven''t bored you with too much info, but wanted to explain my train of thought.
Bob

 

[Lorelei]

Bob you have definitely been doing your homework!!

Thats good that you understand these proportions, is it possible you could find some non steep deep stones?

 

[BobR]

Date: 11/6/2009 5:22:58 PM
Author: Lorelei
Bob you have definitely been doing your homework!!

Thats good that you understand these proportions, is it possible you could find some non steep deep stones?

Lorelei.
The vendor has been extremely helpful iin getting the specs I gave him, unfortunately I didnt give him any restrictions on CA/PA so, I can''t/won''t in all conscience reject them based on paper. However the acid test will be human observation and if my wife and I feel the stones don''t match those in the earrings he''s already sold us, (both in performance and our perception of beauty (see oldminer''s thread on this!!)) then it''ll be back to drawing board.

 

[30yearsofdiamonds]

Twinning wisp is a very misunderstood type of inclusion. First off they are one of the more rarely plotted types of inclusion, partly because the way it is plotted looks alot worse then the the actual inclusion. Years ago the inclusion was defined as ribbon like. Basically it is a "smattering of inclusions that are caught up in a twinning plane and usually snake its way across a diamond. There are usually more then one following a dendritic type of pattern. They are often not easily seen with the naked eye but when louped look quite noticeable or numerous. Today the GIA tries not to plot too many of them and will usually cover the rest with an "additional comment". Not that this matters here but they are most often found in triangular and heart shaped stones that are flat.

I could go on, but that should explain it a little more. I worked there for 25 years.