Quick question on ASETs.

[beaujolais]

Do I have this right:

You do want some green on your ASET, not just mainly red, for good scintillation?

Meaning an ASET with mainly red and some green is better than an ASET that is basically red?

(Both ASETS have quite little white and blue, btw.)

Thanks.

 

[Ellen]

Date: 8/11/2009 4:55:46 PM
Author:sonomacounty

Do I have this right:

You do want some green on your ASET, not just mainly red, for good scintillation?

Meaning an ASET with mainly red and some green is better than an ASET that is basically red?

(Both ASETS have quite little white and blue, btw.)

Thanks.

Basically yes, but amounts depend/can depend. What type of cut is it? Fancy, round?

Here''s a thread that might help you, if you haven''t seen it.

 

[beaujolais]

Thanks Ellen. Old Mine Cut.

Great link. I''ll print it and read it tonight.

Thanks again.

 

[Ellen]

Welcome!

 

[John P]

Each cut has its own way of drawing light.

Modern rounds cut for max light return have a majority of red and a balanced, even distribution of blue face-up. A modern round with too much green will look darker in those areas compared to one showing more red. Leakage should be minimized in brilliants - other than small symmetrical contrast leakage at meet points.

As explained in the link Ellen provided, fancy shapes draw more light from lower angles. Red is still highly desirable in mixed cuts but far more green will be present. This is natural - and isn't a problem since it's what makes these shapes have different character. Red & green still indicate overall brightness but the nature of contrast is different... You won't see the repeated solid-red-next-to-solid-blue in these shapes (which explains why they're not as vivid in contrast as RB). Instead, contrast relies more on the distribution of red & green, along with areas of blue - and sometimes leakage - which are present. The more subtle contrast pattern is why such shapes depend on movement for their dynamic qualities more than rounds do. The distribution of the colors is also more important.

Separate from the above we have step cuts, which are in a world of their own in my opinion.

Edited to add - I see you're looking at an OMC. Nice!

You're likely to see more abundant green than a modern brilliant and very large areas of blue. Antique cuts had wide pavilions designed to capture/reflect the pre-electric lighting of their day. Remember these old world cuts were first produced under gas lanterns...which, incidentally, is where we first got the word "fire" as a descriptor for diamond performance.

 

[Ellen]

Date: 8/11/2009 8:08:49 PM
Author: John Pollard
Each cut has its own way of drawing light.

Modern rounds cut for max light return have a majority of red and a balanced, even distribution of blue face-up. A modern round with too much green will look darker in those areas compared to one showing more red. Leakage should be minimized in brilliants - other than small symmetrical contrast leakage at meet points.

As explained in the link Ellen provided, fancy shapes draw more light from lower angles. Red is still highly desirable in mixed cuts but far more green will be present. This is natural - and isn''t a problem since it''s what makes these shapes have different character. Red & green still indicate overall brightness but the nature of contrast is different... You won''t see the repeated solid-red-next-to-solid-blue in these shapes (which explains why they''re not as vivid in contrast as RB). Instead, contrast relies more on the distribution of red & green, along with areas of blue - and sometimes leakage - which are present. The more subtle contrast pattern is why such shapes depend on movement for their dynamic qualities more than rounds do. The distribution of the colors is also more important.

Separate from the above we have step cuts, which are in a world of their own in my opinion.

Edited to add - I see you''re looking at an OMC. Nice!

You''re likely to see more abundant green than a modern brilliant and very large areas of blue. Antique cuts had wide pavilions designed to capture/reflect the pre-electric lighting of their day. Remember these old world cuts were first produced under gas lanterns...which, incidentally, is where we first got the word ''fire'' as a descriptor for diamond performance.

In a "real'' OMC, I would agree. If we''re talking about GOG''s new Old Miner''s, they tend to have a nice mix, but with more red and a bit of blue. Just thought I''d throw that in for clarification.

 

[beaujolais]

Thanks John, Ellen

-- Edited to add - I see you're looking at an OMC. Nice! --

Ack, I've been found out.

Good intuition, John.

-- Remember these old world cuts were first produced under gas lanterns...which, incidentally, is where we first got the word "fire" as a descriptor for diamond performance. --

Oh, what a neat little bit of information/history there. Thanks for letting us in on that.

Also, link to the ASET of the stone in my avitar. Comments welcome. Click on "OK" if you get a box that comes up in the middle of the screen. (GOG recently fixed up and set this old antique cushion for me.)

http://www.goodoldgold.com/diamond/5685after

 

[John P]

Date: 8/11/2009 8:43:05 PM
Author: Ellen

Date: 8/11/2009 8:08:49 PM
Author: John Pollard
You''re likely to see more abundant green than a modern brilliant and very large areas of blue. Antique cuts had wide pavilions designed to capture/reflect the pre-electric lighting of their day. Remember these old world cuts were first produced under gas lanterns...which, incidentally, is where we first got the word ''fire'' as a descriptor for diamond performance.

In a ''real'' OMC, I would agree. If we''re talking about GOG''s new Old Miner''s, they tend to have a nice mix, but with more red and a bit of blue. Just thought I''d throw that in for clarification.

Hi Ellen.

Indeed I was talking in historic terms. When I hear OMC I think heirloom & estate pieces with diamonds styled in the 1800s. In their heydey these shapes were produced without benefit of girdling machines or even rotary saws, making many of them technically clumsy but quite romantically appealing. The ASET image of a true old-world OMC/OEC should be taken with understanding and respect for "what it is."

On Pricescope our local Rhino''s recent OMC reproduction has the benefit of his astute knowledge, plus modern tools & machining. Kind of like a Model T but with a Ferrari engine! (a batmobile engine?)

It''s a remake of a classic with the benefit of hot performance through many illumination scenarios.

 

[Ellen]

Date: 8/11/2009 9:21:43 PM
Author: sonomacounty
Thanks John, Ellen

-- Edited to add - I see you''re looking at an OMC. Nice! --

Ack, I''ve been found out.

Good intuition, John.

-- Remember these old world cuts were first produced under gas lanterns...which, incidentally, is where we first got the word ''fire'' as a descriptor for diamond performance. --

Oh, what a neat little bit of information/history there. Thanks for letting us in on that.

Also, link to the ASET of the stone in my avitar. Comments welcome. Click on ''OK'' if you get a box that comes up in the middle of the screen. (GOG recently fixed up and set this old antique cushion for me.)

http://www.goodoldgold.com/diamond/5685after

sonoma, the ASET looks great, and your stone is beautiful!!

And you''re welcome!

 

[stone-cold11]

Nice ASET.

 

[beaujolais]

Thanks Ellen, Stone Cold.

I really do appreciate your looking and opinions. I''m not expert at this yet. Thanks very much, again.

Sonoma

 

[strmrdr]

one thing to watch out for is large patches of unbroken up green around the edges.
This was actually an advantage in the old days but not so hot these days if you use overhead lighting in your house or work in an office.
As far as scintillation static ASET does not tell you much, you have to look at the VF''s.
ASET tends to blend VF''s together.
This is one reason I like 3d scan based Asets when done with a helium scanner and DC.
I don''t like the ones AGS is putting on their reports at all, to many errors and to few details.

 

[John P]

Date: 8/12/2009 10:54:55 AM
Author: strmrdr
one thing to watch out for is large patches of unbroken up green around the edges.
This was actually an advantage in the old days but not so hot these days if you use overhead lighting in your house or work in an office.

But what if ye live in a quaint auld homestead with cheery candles, an oil lamp and a fine wyf churnin'' butter?

 

[jet2ks]

Date: 8/12/2009 11:58:46 AM
Author: John Pollard

Date: 8/12/2009 10:54:55 AM
Author: strmrdr
one thing to watch out for is large patches of unbroken up green around the edges.
This was actually an advantage in the old days but not so hot these days if you use overhead lighting in your house or work in an office.

But what if ye live in a quaint auld homestead with cheery candles, an oil lamp and a fine wyf churnin' butter?

And yet have internet to check out PS? Interesting dichotomy.

 

[Lorelei]

Date: 8/12/2009 11:58:46 AM
Author: John Pollard

Date: 8/12/2009 10:54:55 AM
Author: strmrdr
one thing to watch out for is large patches of unbroken up green around the edges.
This was actually an advantage in the old days but not so hot these days if you use overhead lighting in your house or work in an office.

But what if ye live in a quaint auld homestead with cheery candles, an oil lamp and a fine wyf churnin' butter?

Then thee can afford more greene in thy ASET.

 

[beaujolais]

Thanks all, again.

-- As far as scintillation static ASET does not tell you much, you have to look at the VF's.
ASET tends to blend VF's together. ---

Now, how does one do that? You, we know, can do that backwards in your sleep (compliment, I am in awe of Storm). I do have an ASET and Sarin for it. ---


-- This is one reason I like 3d scan based Asets when done with a helium scanner and DC. --

What's a DC?

---

J.P. is one funny guy.

Rhino in the above Batmobile line is hysterical.

----

Must go churn ye olde butter now.

 

[Ellen]

Date: 8/12/2009 1:45:51 PM
Author: sonomacounty


Must go churn ye olde butter now.

Please, you''re giving the rest of us a bad name.

 

[stone-cold11]

DC is DiamCalc. Similar to gem advisor I believe.

 

[Lorelei]

Date: 8/12/2009 1:45:51 PM
Author: sonomacounty
Thanks all, again.

-- As far as scintillation static ASET does not tell you much, you have to look at the VF's.
ASET tends to blend VF's together. ---

Now, how does one do that? You, we know, can do that backwards in your sleep (compliment, I am in awe of Storm). I do have an ASET and Sarin for it. ---


-- This is one reason I like 3d scan based Asets when done with a helium scanner and DC. --

What's a DC?

---

J.P. is one funny guy.

Rhino in the above Batmobile line is hysterical.

----

Must go churn ye olde butter now.

DiamCalc which is a computer program used for diamond simulation, read more below.

http://www.pricescope.com/MSU/default.asp

 

[John P]

Date: 8/12/2009 2:21:34 PM
Author: Stone-cold11
DC is DiamCalc. Similar to gem advisor I believe.

Yes. Rhino includes a 3D model & gemadvisor link on the profile page.

(C''mon Ellen, my wyf looks way hot churning butter

)

 

[beaujolais]

-- Rhino includes a 3D model & gemadvisor link on the profile page. ---

Oh, that. I've got those on the old stone. Thanks.

---

I do bet some gorgeous women have churned many a butter (?).

But, I have a thing for that era, anyway.