Experts opinions needed - Is this a yield issue?

[Stephan]

In this case number 2 because number 1 looks too dark.

 

[strmrdr]

Date: 8/30/2008 12:10:44 PM
Author: QueenMum
In this case number 2 because number 1 looks too dark.

41/33/80/50 on the left and 41/34/80/65 on the right both 55T.
I even rotated the one on the left to make it look better and it still lost.

 

[strmrdr]

Here it is with 65 stars it doesn''t help much....

 

[Stephan]

Date: 8/30/2008 12:12:59 PM
Author: strmrdr
41/33/80/50 on the left and 41/34/80/65 on the right both 55T.
I even rotated the one on the left to make it look better and it still lost.

Now I''m lost, I thought in the very first picture you posted (where I had a hard time to choose) that the 41P was on the right?
And to compare with the 41/33, I thought you used the left one from the first picture?
Sorry, help me!

 

[strmrdr]

Date: 8/30/2008 12:21:37 PM
Author: QueenMum

Date: 8/30/2008 12:12:59 PM

Author: strmrdr

41/33/80/50 on the left and 41/34/80/65 on the right both 55T.

I even rotated the one on the left to make it look better and it still lost.

Now I''m lost, I thought in the very first picture you posted (where I had a hard time to choose) that the 41P was on the right?

And to compare with the 41/33, I thought you used the left one from the first picture?

Sorry, help me!

The 41 has the yellow V shaped area in the center in all the pictures.

 

[strmrdr]

here is the 41 used in all images...

 

[Stephan]

Thanks Karl!
Very nice combo!

 

[Stephan]

I have to take a bath now and go out for dinner.
It would be very interesting to compare your nice combo, to the same one with 50% stars and 75% lgf.

 

[strmrdr]

Date: 8/30/2008 12:39:06 PM
Author: QueenMum
I have to take a bath now and go out for dinner.

It would be very interesting to compare your nice combo, to the same one with 50% stars and 75% lgf.

Not a great combo 75% lgf is a mismatch for the combo but it does score well on brightness.
You might like it however.

 

[strmrdr]

Date: 8/30/2008 10:44:36 AM
Author: strmrdr
This light bar above the mirror or one on each side and sometimes even on 3 sides that really makes diamonds pop


http://www.amazon.com/Sea-Gull-Lighting-Stainless-4739-98/dp/B000W0KCT2/ref=sr_1_6?ie=UTF8&s=furniture&qid=1220107336&sr=1-6


It would be a good light source to model as direct lighting as it is very very common in the US


This is also an example of the lighting that is being banned in the US.

It will be replaced by much softer cft or florescent tube lighting.

Here is a model of this lighting.

 

[strmrdr]

Here is a princess in the same lighting

 

[strmrdr]

asscher in same lighting

 

[strmrdr]

Here is my monster that DiaGem cut

 

[strmrdr]

Actual scan of an 8* used to create the model in the same lighting.
Not the best lighting for 8* style cutting just like it isn''t the best for asschers for the same reasons.

 

[strmrdr]

actual scan of an oec used to create the image.

 

[Stephan]

I can imagine this kind of lighting, even if in the realty it looks slightly different.

Congrats, your new cut is interesting, is it very tolerant in angle variations?
Is it easy for DiaGem to respect this tolerance?
Is there a place where I can read more about your creations?

 

[strmrdr]

Date: 8/31/2008 12:44:19 PM
Author: QueenMum
I can imagine this kind of lighting, even if in the realty it looks slightly different.


Congrats, your new cut is interesting, is it very tolerant in angle variations?

Is it easy for DiaGem to respect this tolerance?

Is there a place where I can read more about your creations?

Here is the story of the monster asscher
https://www.pricescope.com/community/threads/why-cut-asschers-with-small-corners-and-windmills.78433/

Yes it is reproducible and tolerant.
DiaGem can cut them but it is not easy as they cant be slopped together.

To see some of my other designs do a PS search limited to author and using the keyword monster then repeat using the keyword nightmare.

 

[strmrdr]

What is interesting is that some extremely shallow diamonds work very well in that lighting.
This one looks a lot like the princess above when moved.
31.5C 40.0P lgf% 78% stars 50% 57t

 

[Serg]

Date: 8/28/2008 6:38:34 PM
Author: DiaGem

Date: 8/28/2008 6:30:00 PM
Author: strmrdr

Date: 8/28/2008 6:17:20 PM
Author: DiaGem
I think you are talking about the CA combination while I am talking about 55 vs 65 degree star facets...

I was but....
They actually go together.
With a shallower crown you lengthen out the stars which makes the upper girdles steeper which gives you more dispersion.
Which is also why you don't combine long stars with steeper crown angles because they become to steep and start to leak.

You realy believe there is such a significant difference?

How much do you think the star angle would differ between a 55 and 65 deg. on a steep 35-35.5 deg. crown main?

Diagem,
re:You realy believe there is such a significant difference?

For LR it is not critical but important for Fire and Scintillation
See deats images for Star facets 50% and 65%( both P40.75Cr34.5)
Distribution is different and diamond with 65% has better Life( see more longer “Speed of virtual facets” . More longer “Speed of virtual facets” has warm color

 

[Serg]

65%

 

[diagem]

Date: 9/1/2008 5:16:09 PM
Author: Serg

Date: 8/28/2008 6:38:34 PM
Author: DiaGem

Date: 8/28/2008 6:30:00 PM
Author: strmrdr

Date: 8/28/2008 6:17:20 PM
Author: DiaGem
I think you are talking about the CA combination while I am talking about 55 vs 65 degree star facets...

I was but....
They actually go together.
With a shallower crown you lengthen out the stars which makes the upper girdles steeper which gives you more dispersion.
Which is also why you don't combine long stars with steeper crown angles because they become to steep and start to leak.

You realy believe there is such a significant difference?

How much do you think the star angle would differ between a 55 and 65 deg. on a steep 35-35.5 deg. crown main?

Diagem,
re:You realy believe there is such a significant difference?

For LR it is not critical but important for Fire and Scintillation
See deats images for Star facets 50% and 65%( both P40.75Cr34.5)
Distribution is different and diamond with 65% has better Life( see more longer “Speed of virtual facets” . More longer “Speed of virtual facets” has warm color

Is it because the vf are a bit longer when viewing through a longer star facet window?

Or is it because the star facet angle is a bit steeper so the the view through the star facet is angled more towards the direction of the culet?

 

[Serg]

Date: 9/1/2008 5:42:47 PM
Author: DiaGem

Date: 9/1/2008 5:16:09 PM
Author: Serg

Date: 8/28/2008 6:38:34 PM
Author: DiaGem

Date: 8/28/2008 6:30:00 PM
Author: strmrdr

Date: 8/28/2008 6:17:20 PM
Author: DiaGem
I think you are talking about the CA combination while I am talking about 55 vs 65 degree star facets...

I was but....
They actually go together.
With a shallower crown you lengthen out the stars which makes the upper girdles steeper which gives you more dispersion.
Which is also why you don''t combine long stars with steeper crown angles because they become to steep and start to leak.

You realy believe there is such a significant difference?

How much do you think the star angle would differ between a 55 and 65 deg. on a steep 35-35.5 deg. crown main?

Diagem,
re:You realy believe there is such a significant difference?

For LR it is not critical but important for Fire and Scintillation
See deats images for Star facets 50% and 65%( both P40.75Cr34.5)
Distribution is different and diamond with 65% has better Life( see more longer “Speed of virtual facets” . More longer “Speed of virtual facets” has warm color

Is it because the vf are a bit longer when viewing through a longer star facet window?

Or is it because the star facet angle is a bit steeper so the the view through the star facet is angled more towards the direction of the culet?

Diagem,
I think reason is new angle for crown girdle facets( 44degree instead 41)

see pictures and name files

 

[Serg]

55%

 

[Serg]

65%

 

[Serg]

50%

 

[Serg]

65%

 

[Stephan]

Thank you Serg, this is very interesting!
If I understand what you write, longer stars aren''t badder.

I found the following link online:
LINK
It''s an old patent of the GIA.
They seemed to say that slightly longer stars makes a more firey diamond, perhaps did they change their opinion when inventing the Facetware?

Serg, if a diamond is not on the steep/deep side, is there any inconvenient if this diamond has longer stars? And is there any benefit?

Thanks!

 

[Serg]

Date: 9/2/2008 1:11:02 PM
Author: QueenMum
Thank you Serg, this is very interesting!
If I understand what you write, longer stars aren''t badder.

I found the following link online:
LINK
It''s an old patent of the GIA.
They seemed to say that slightly longer stars makes a more firey diamond, perhaps did they change their opinion when inventing the Facetware?

Serg, if a diamond is not on the steep/deep side, is there any inconvenient if this diamond has longer stars? And is there any benefit?

Thanks!

Serg, if a diamond is not on the steep/deep side, is there any inconvenient if this diamond has longer stars?

Stephan,

I do not know yet. Cutters usually use star facets near 50% to receive two squares on table . One square rotate from other on 45 degree. Do you see it?

They used it early to proof quality of cut( Now they use H&A) . Just it

If you increase star facets or increase crown angle you receive same result for crown girdle facets. Of course main crown facets have different angles.

We just do research now . We try find round diamond with higher Fire . See stones 15-18.
http://www.octonus.com/oct/mss/
We checked different Pavilion girdle facets.
Now we will use star facets in optimization. If diamond with star facets 65% win, we l cut it and you wil receive answer in few months

 

[Serg]

Sorry, I can not post answer. Have technical problem with PS

 

[Serg]

Date: 9/2/2008 1:11:02 PM
Author: QueenMum
Thank you Serg, this is very interesting!
If I understand what you write, longer stars aren''t badder.

I found the following link online:
LINK
It''s an old patent of the GIA.
They seemed to say that slightly longer stars makes a more firey diamond, perhaps did they change their opinion when inventing the Facetware?

Serg, if a diamond is not on the steep/deep side, is there any inconvenient if this diamond has longer stars? And is there any benefit?

Thanks!

re:They seemed to say that slightly longer stars makes a more firey diamond, perhaps did they change their opinion when inventing the Facetware?

Stephan, See answer:

https://www.pricescope.com/community/threads/star-facets-65.94175/