scintillation?

[ShoppingForARing]

what do i look for, or ask for, in ring specs to get the most scintillation? at the store, it could look shiny, but a few weeks later i want it to retain the sparkle...

is there any studies to ask for? if so, what on the study is a good, excellent, and poor score....


any help on this subject would be great!!!!

 

[Garry H (Cut Nut)]

Not an easy topic, but you can get some guidance for round stones from HCA cut adviser under "tools" on the top tool bar.
Crushed ice radiants probably have the most ''scintillation though.

 

[ShoppingForARing]

can you explain what i look for in these:

HCA and Ideal-scope developer www.ideal-scope.com and www.HollowayDiamonds.com.au

ideal scope report? i''m quite new...

 

[Herfnerd]

Best thing to do is read up on the various threades and under the Knowledge pull down

 

[strmrdr]

define most?
In relation to what?
What shape?

Scintillation is just one part of overall performance and appearance.
For example a 300 facet cut at .5ct would have a lot of scintillation but likely look like a dog''s yesterdays breakfast today.

 

[Paul-Antwerp]

Date: 8/3/2008 9:56:47 PM
Author: Garry H (Cut Nut)
Not an easy topic, but you can get some guidance for round stones from HCA cut adviser under ''tools'' on the top tool bar.
Crushed ice radiants probably have the most ''scintillation though.

Scintillation is the unstudied part of light performance. As such, it is a very confusing topic, and there is no agreement on the subject.

Scintillation is the sparkle, observed when either the light source, the observer or the diamond is moving. The ''moving'' aspect is very important, and it is probably very difficult to predict from a static view.

Also important is the fact that it needs to be observed. The ongoing scintillation studies of AGS (not finished yet) say that it is probably necessary to have a mixture of big, medium- and small-size flashes (scintillation events). As such, I disagree that ''crushed ice''-radiants have the most scintillation. They may show a lot of small size flashes, but I would not call this good scintillation.

 

[Paul-Antwerp]

Date: 8/3/2008 10:20:21 PM
Author: strmrdr

Scintillation is just one part of overall performance and appearance.
For example a 300 facet cut at .5ct would have a lot of scintillation but likely look like a dog''s yesterdays breakfast today.

For me, scintillation cannot be judged separately from other light performance-aspects, like brightness and fire. According to me, scintillation is the mother of brightness and fire. If one observes no flash, no scintillation, there is no brightness or fire to observe.

It highly depends on the size of the flash, whether one observes brightness or fire too. Thus, it is the unstudied basis of light performance, I would say.

Plus, I disagree that more facets create more scintillation. That all depends on whether the observer will observe that flash, which is to start smaller and can go in a hundred directions.

 

[strmrdr]

Date: 8/4/2008 11:36:17 AM
Author: Paul-Antwerp

Date: 8/3/2008 10:20:21 PM

Author: strmrdr


Scintillation is just one part of overall performance and appearance.

For example a 300 facet cut at .5ct would have a lot of scintillation but likely look like a dog''s yesterdays breakfast today.

For me, scintillation cannot be judged separately from other light performance-aspects, like brightness and fire. According to me, scintillation is the mother of brightness and fire. If one observes no flash, no scintillation, there is no brightness or fire to observe.


It highly depends on the size of the flash, whether one observes brightness or fire too. Thus, it is the unstudied basis of light performance, I would say.


Plus, I disagree that more facets create more scintillation. That all depends on whether the observer will observe that flash, which is to start smaller and can go in a hundred directions.

According to me scintillation is the child of fire and brightness.
A mirror has fire and brightness but very little scintillation.

I actually think that separating scintillation into colored and white light is silly a flash is a flash is a flash.

More virtual facets will have more flashes.
Now they may blend together and be seen as one flash but they are still there. (little separation)
They also may not be headed towards the eye but they are still there.

 

[strmrdr]

Date: 8/4/2008 11:29:11 AM
Author: Paul-Antwerp
I disagree that 'crushed ice'-radiants have the most scintillation. They may show a lot of small size flashes, but I would not call this good scintillation.

That would be personal preference.
Someone else looking at them may think they were the best thing since the invention of the faceting machine.
For small amounts of movement they do have the most flashes and will shimmer which some people love.
The smaller the virtual facets the less movement it takes to give the diamond life.
Now that is one area a mix of virtual facet sizes is good because it gives some sparkle over a wide range in the amount of movement.
With small movements in bright light the smaller virtual facets fire giving the diamond life.
In dim lighting and more movement the larger virtual facets fire giving it life.
Want to see this?
look at an asscher, for small movements in bright light the smaller virtual virtual facets under the steps are what gives the diamond scintillation.
Move the diamond more and the very large virtual facets under the table come into play.
My article on virtual facets will cover this in detail.

 

[John P]

Date: 8/4/2008 3:49:40 PM
Author: strmrdr

Date: 8/4/2008 11:29:11 AM
Author: Paul-Antwerp
I disagree that 'crushed ice'-radiants have the most scintillation. They may show a lot of small size flashes, but I would not call this good scintillation.

That would be personal preference...

Always true. I think in many cases most viewers would agree with the highlighted if the scintillation events were too small to be perceived at all ... which is more likely in this kind of situation, depending on faceting & angles, the lighting on the stone, the lighting envoronment's influence on the observer's pupil and the distance of the observer from the stone.

 

[strmrdr]

Date: 8/4/2008 4:25:20 PM
Author: John Pollard

Date: 8/4/2008 3:49:40 PM

Author: strmrdr

Date: 8/4/2008 11:29:11 AM

Author: Paul-Antwerp

I disagree that ''crushed ice''-radiants have the most scintillation. They may show a lot of small size flashes, but I would not call this good scintillation.

That would be personal preference...

Always true. I think in many cases most viewers would agree with the highlighted if the scintillation events were too small to be perceived at all ... which is more likely in this kind of situation, depending on faceting & angles, the lighting on the stone, the lighting envoronment''s influence on the observer''s pupil and the distance of the observer from the stone.

on the other side of the coin you have many small flashes with little separation and you would get a shimmering look as they blend together.
It would be different than what many people might think of as scintillation but it still is.
A friend of mine''s wife calls it "star twinkle" on her princess cut.
Her only instructions to him were that she wanted a diamond that twinkles like a star.
So he found one.
Next time I see them I going to ask to look at the stone as I am curious as how many facets the pavilion has on it.

 

[Paul-Antwerp]

Date: 8/4/2008 3:36:05 PM
Author: strmrdr

Date: 8/4/2008 11:36:17 AM
Author: Paul-Antwerp

Date: 8/3/2008 10:20:21 PM

Author: strmrdr


Scintillation is just one part of overall performance and appearance.

For example a 300 facet cut at .5ct would have a lot of scintillation but likely look like a dog''s yesterdays breakfast today.

For me, scintillation cannot be judged separately from other light performance-aspects, like brightness and fire. According to me, scintillation is the mother of brightness and fire. If one observes no flash, no scintillation, there is no brightness or fire to observe.


It highly depends on the size of the flash, whether one observes brightness or fire too. Thus, it is the unstudied basis of light performance, I would say.


Plus, I disagree that more facets create more scintillation. That all depends on whether the observer will observe that flash, which is to start smaller and can go in a hundred directions.

According to me scintillation is the child of fire and brightness.
A mirror has fire and brightness but very little scintillation.

I actually think that separating scintillation into colored and white light is silly a flash is a flash is a flash.

More virtual facets will have more flashes.
Now they may blend together and be seen as one flash but they are still there. (little separation)
They also may not be headed towards the eye but they are still there.

A mirror has brightness (fire ???), but it is observeable? That depends on the lighting environment.

To me, when moving either the mirror, the observer or the light, one can observe a flash. With a mirror, the chance of observing this flash is small, thus the mirror has little scintillation. Whether one observes brightness or fire, depends upon the observation of that flash. Hence, my reasoning that scintillation comes first, and brightness and fire second.

We simply have a different point-of-view: For me, the question is what is observed, for you, it is what is coming out of the stone.

Live long,

 

[strmrdr]

kind of a silly thing to argue about but without fire and brightness scintillation doesn''t exist.
Therefore it cant be the parent.