Brilliance Scope Anomaly

[thgood]

Similar stones are being graded on 3 different shape scales with the brilliance scope:

Square
Mod-Square
Rectangular

Why is this important? I want to compare princess, radiant and luceres.

For example a radiant that was brilliance scoped as rectangular graded as:
very-high, very-high, very-high.

Take the exact same stone and grade it with mod-square setting and it came back:
LOW, medium-high, high!

I have seen luceres graded as both square and mod-square. Mod-square seems to be the harder scale. The brilliance scope automatically picks the setting but it can be overridden by the operator.

Jubilee seem to be graded as square and typically all off the charts (look at GOG). Maybe they should have been graded by mod-square shape?? You cannot differentiate between things if they go off a scale!

I think the brilliance scope needs to compare a stones light return to the best possible performance of a particular cut (not general shape)... and also compare that to the general performance of other similar cuts.

This is just my opinion but I think it is a big issue - please comment if you agree or not.

 

[ep6585]

I think GemEx determines which scale is used for each shape. Both the GOG website and www.jubileecut.com compare a jubilee and a princess cut on both the square scale and the round scale.

 

[valeria101]

Speaking of GOG... you may want to use the GemAdviser rather than the Bscope for reference - the same scale is used for ranking all shapes on the "cut quality" estimation by the GemAdviser, and you get more details dissected about light return too.

 

[researcher]

As far as I know, the BScope is designed to tell you how your stone performs with stones of the same shape (they gathered hundreds or thousands of stones of different weights/colors etc. and came up with cutoffs for each of the scores, so certain shapes are contained only in one category). I can see why you want to determine which performs better and therefore want the stones analyzed together, but it comes back to the debate of whether women should be given the exact same test as men when trying out for the fire dept. etc.--some women will perform just as well as men, but to be fair women are graded against women. It seems to be the same with diamonds. For instance, with the modified square testing, you're going to have stones with their corners cut. And where do square cut stones lose the majority of their light? The corners. It could therefore be that, if the corners were not considered, the square stone would be a better performer. IMO, the only reason to use the BScope is to make sure that, once you've decided on a shape, you don't end up with a dud. I knew going into choosing a stone that the princess is not the best with light return, but I like its shape more than the rest. So, I was willing to sacrifice some of the light return. BUT, I was not willing to settle on a stone that did not score VH-VH-VH (or at least have 2 VH and a H). I don't know if this helps, but I hope you can see at least a little why it's, if not important, understandable why different stones are broken up into separate scales on the BScope

 

[Superidealist]

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On 6/11/2004 1:26:20 PM researcher wrote:

I don't know if this helps, but I hope you can see at least a little why it's, if not important, understandable why different stones are broken up into separate scales on the BScope
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Diamonds of different shapes aren't compared on the same scale because the Brilliance Scope is first and foremost a sales tool and using a single scale across the board would make the sale of certain shapes more difficult.

 

[researcher]

I realize that the BScope is a sales gimmick, but even though I know that rounds are the most brilliant shape and others just don't compare, I would never get one. I have three rings that have been passed down in the family or have been bought for me as gifts, and I just don't like the way they look. They're beautiful diamonds (and range in size from 1.5 ct solitaire-2.8 ctw), but I am planning to turn them into a necklace or something because I just won't wear them. Anyway, my point is that people who like certain shapes will go for them no matter what. I just think it's nice to know how your stone compares to others that are similar