RB numbers experts assistance requested

[fuzzylogic]

Hi,

Gypsy suggested that I post this up and see what the experts thought of the "type of diminished light return you can expect given the numbers of the following stone"


Thanks in advance!

 

[minmin001]

can barely see the #s. do you have anything bigger?

 

[fuzzylogic]

sorry ... let's see if this helps ...

 

[stone-cold11]

http://www.agslab.com/pdf_sync_reports/1040405910006-PLDQR.PDF

Cut for brilliance, performance probably deducted from fire performance.

 

[oldminer]

Tab Percent: 1A
Crown Angle: 2A
Crown Height: 1A
Pavilion Depth: 1B
Girdle: 1A
Depth: 1A
Polish: 1A
Symmetry: 1A
TotalGrade: 1B

Above is the result of the AGA Cut Class grader https://www.pricescope.com/tools/AGA_NAJA_Cut_Class_Grader

A tiny bit shallow crown angle and a little extra pavilion depth, but within the norms for an Ideal Cut diamond.

 

[yssie]

I had a similar stone - mine had a bigger table. Very bright (not "leaky" - no excess light escape out the back through the pavilion facets instead of being returned face-up), but essentially as SC says - visible lack of coloured light return compared to other similarly-sized stones of different proportions.


All diamonds return what light there is around them to return - in spotlights all diamonds show coloured light, in diffuse office lights all diamonds show are white/black checkerboard canvasses. In 'intermediate' types of light return between those two extremes different stones of different proportions will err toward white or coloured light return. Shallow crown/complementary pavilion, larger table, thinner mains (longer lgf) indicate the stone will show lots of quick, white twinkles; high crown, small table, thick mains usually indicate fewer but more powerful flashes and more potential for colour. One type isn't "better" than the other - just different, and if you know that you specifically prefer to see white light over coloured this stone looks like a great fit.


Different people may or may not see these differences (I do, but I spend far too much time playing with my pet rocks), still others may or may not like/care about any differences they see... If you're interested I would strongly recommend having it shipped out to inspect, and taking it in to your local jeweller and comparing to some other similarly sized stones of different proportions - see what your eyes think.


Proportions charts: http://stage.agslab.com/proportion-based-cut-grade.php

ETA: just tried the links and they're not working, have contacted AGSL*

 

[fuzzylogic]

Thank you all for your knowledge. I have only been here for the last month and am astounded at the level of expertise and helpfulness of the people on this forum.

 

[Gypsy]

Thank you all for your knowledge. I have only been here for the last month and am astounded at the level of expertise and helpfulness of the people on this forum.

I knew between Yssie and Stonecold you'd get the information you needed. Aren't they great?

Sounds like it is definitely worth taking a closer look at to me to see if you guys like it.