Brilliancescope help needed

[kgrap]

Hello,

Can anyone help me with this question. If a diamond scores Very High on Colour Light, Very high on Scintillation but ''only'' High on White light, is there a problem with the diamond? It scores under 2 on the HCA as well.

Thanks

 

[strmrdr]

maybe maybe not.
Could just be cut to favor fire over white light return.
Where did it fall in the high zone?
Where did color light fall in the vh zone?
What are the crown and pavilian angles?

 

[kgrap]

Date: 9/6/2005 4:24:07 PM
Author: strmrdr
maybe maybe not.
Could just be cut to favor fire over white light return.
Where did it fall in the high zone?
Where did color light fall in the vh zone?
What are the crown and pavilian angles?

White Light was in the middle of the High zone, Colour light was at the maximum of the Very High zone.
Scintillation was in the middle of the Very High zone

crown angle is 34.4 and pavillion is 40.8

 

[belle]

nice angles

 

[strmrdr]

With those angles sounds like a shorter LGF% is kicking it down which isnt always a bad thing.
that has some advantages in indirect light but need more info to say if that is the case.
A sarin file would answer the question.

 

[kgrap]

Date: 9/6/2005 4:36:34 PM
Author: strmrdr
With those angles sounds like a shorter LGF% is kicking it down which isnt always a bad thing.
that has some advantages in indirect light but need more info to say if that is the case.
A sarin file would answer the question.

Thank you strmrdr, heres a link to the sarin file:

http://www.anodyne.biz/sarin.srn

I really appreciate your help

 

[strmrdr]

yep 77% lgf kick it up to 80% and it would have got the 3rd VH.

But it isnt that bad a thing.
The diamond returns a lot of light it just returns it as fire.
The pavilian is 40.8 on 7 and 40.9 on 1 perfect for driving a lot of light return.

If you like fiery diamonds then it deserves a new home.

If you like more white light return then there are some out there that will do it.

 

[ame]

Mine returns more white than fire...I kind of wish it was the other way around someitmes.

 

[kgrap]

Date: 9/6/2005 4:53:05 PM
Author: strmrdr
yep 77% lgf kick it up to 80% and it would have got the 3rd VH.

But it isnt that bad a thing.
The diamond returns a lot of light it just returns it as fire.
The pavilian is 40.8 on 7 and 40.9 on 1 perfect for driving a lot of light return.

If you like fiery diamonds then it deserves a new home.

If you like more white light return then there are some out there that will do it.

Thanks very much for the review. But what is an lgf? at the risk of sounding dumb. What exactly is white light return though? Indoor lighting? I know nothing about diamonds

 

[belle]

lgf=lower girdle facet
here are some examples of what the different lgf %'s would look like

 

[strmrdr]

direct = sunlight outside, bright regular light bulbs, halagen lighting, reading lamps.
indirect = indirect sunlight, most flourecent lighting, shaded light bulbs, reflected light.

LGF is described here:
http://www.goodoldgold.com/minor_facets.htm

The stars are around 62%

Interesting diamond from a cut standpoint.

 

[belle]

Date: 9/6/2005 4:58:16 PM
Author: kgrap

Date: 9/6/2005 4:53:05 PM
Author: strmrdr
yep 77% lgf kick it up to 80% and it would have got the 3rd VH.

But it isnt that bad a thing.
The diamond returns a lot of light it just returns it as fire.
The pavilian is 40.8 on 7 and 40.9 on 1 perfect for driving a lot of light return.

If you like fiery diamonds then it deserves a new home.

If you like more white light return then there are some out there that will do it.

Thanks very much for the review. But what is an lgf? at the risk of sounding dumb. What exactly is white light return though? Indoor lighting? I know nothing about diamonds

white light return means that a diamond would be more sparkly with ...well...''white'' as opposed to more flashes of different colors, or fire.

 

[strmrdr]

the b-scope gives an indication of the direct light performance of the diamond.

isee2, vendors eyeballs, and diamcalc can indicate the indirect light performance.
With that crown/pavilion combo there wont be any problems.

And what belle said :}

 

[kgrap]

Thanks for the pics Belle. So the lgf is related to the thickness of the black star bit? I''ve noticed Eightstar diamonds have thick main stars too, they dont score Very Highs on the White light return either.

 

[RockDoc]

While the B Scope Analyzer Report is meaningful and informative, it''s sister piece of equipment - The B Scope Viewer is also needed.

The unfortunate part is you have to present to see the results. It does show to the human eye, the differences....


The B Scope Analyzer really functions with a "robotic" eye, and measure light intensity along with movement and pixel counting.

While the B Scope DOES report white light, color return, and scintillation the rating is based on a lot of factors that assess very differently than the human eye.

The B Scope Viewer results for the practical side of things is a bit more understandable as to the results that the Analyzer for a consumer or an expert.

Gemex has done some incredible stuff with the Analyzer, but one must ALWAYS remember it is not showing beauty, it is rating and showing light return. Depending on the location of the light return and type of light return, a very high B Scope rating does ALWAYS indicate BEAUTY. Many times it does, but the eye HAS to be BOSS here.

I have seen some incredibly beautiful fancy shaped diamonds get rated a bit lower because of this. I''ve also seen some VH/VH/VH stones be a little less attractive even though there might be a location of the light return issue.

The human eye''s view is a very necessary part of the analysis, and the viewer instrument makes it a lot easier to discern the individual characteristics, even to a layman.

Rockdoc