How do you interpret Firetrace images?

[BlueReneeNeko]

I have a princess cut diamond that I bought and was able to get some firetrace images but do not know how to interpret them to tell if the diamond is any good. Does anyone know how to interpret these Firetrace images?

The first is the top view and the second is the bottom view.

 

[BlueReneeNeko]

Also if anyone can spare some time can someone run Diamcalc for the following specs?

Ct. 1.759
Diameter 8.29 (6.46-6.50) [1.0%]
Total Depth 74.3% 4.80 mm
Crown Angle 45.6 (43.8-46.2)
Crown Height 13.6% (13.6-13.6)
Pavilion Angle 39.3 (39.0 - 39.5)
Pavilion Depth 57.8% (57.7-58.2)
Cutlet 1.0%
Table Size 72.6% (70.9-74.4)
Girdle 2.2% (1.8-2.5)

It would be much appreciated as I am beginning to be a little wary about the performance of the diamond and would like some reassurance that the purchase was ok.

 

[Garry H (Cut Nut)]

There is an additional crown and pavilion angle need to do this. But then the model would be perfectly symmetrical and you stone is not.

You need to send one of us a Sarin 3D file to do this properly

 

[BlueReneeNeko]

Does anyone know where I can take my diamond to get a 3d Sarin model in the Bay Area, California? I looked at the listings for appraisers in the area but none of them mention that they have a Sarin machine.

 

[Rhino]

Hi Blue,

The FireTrace images are showing how this stone would look under an H&A viewer with blue coloring. There should also be an "intensity" reading along with the FireTrace results and perhaps even a graph showing the results for metrics of brilliance, dispersion and scintillation.

While we have the hardware/software from OGI I am more familiar with Sarin/Helium results and ray tracing via DiamCalc so I can''t give you the commentary you''re seeking. The results shown in the OGI are according to the algorithms input by OGI.

For reference here is a stone I scanned in for ya which is of a princess cut with AGS Ideal Light Performance.

Hope this helps.

 

[Rhino]

One other point of note. The OGI scanner has an option to save files in stereo lithographic format (.stl extension) which is a file that can easily be imported into the MSU DiamCalc software for further analysis.

Peace,

 

[BlueReneeNeko]

Thanks for the analysis of the other stone Rhino. I actually have the .ogi file from when the diamond was scanned with the megascope. I think because I don''t have the full software and can only view the file using the free web based viewer that I''m not able to see the full picture and that''s why it doesn''t give me an "intensity" reading but I might be mistaken as I don''t have the software. Would you mind if I emailed you the file if that were the case?

Also, would that OGI file work with the Diamcalc software? It has a .ogi file extension and the file type is shown as an OGI3D Datafile.

Looking at the picture of the AGS Ideal cut and comparing that to my diamond it looks like the brighter or less black there is the better the light return. If that is the case it looks like the diamond I purchased may not be the top performer that I hoped it would be.

I am already past the 2 week return period and had been relying on the appraiser mentioned in the post titled a "Frustrating appraisal experience" to supply me with brilliancescope reports and additional information so I could determine if it was a good diamond but those reports were never provided. Although I am somewhat satisfied with the diamond''s performance I feel that if I had all the information that I had requested I might have actually returned the diamond if I knew there would be better performers within the same price range.