HOW TO CHANGE ON GEM CUT STUDIO THE DIAGRAM ANGLES FOR A DIFFERENT RI?

[mongui]

I would like to know how to use certain diagram for and specific RI to be adapted to a material with a different RI but keeping the same design. Is that possible with Gem Cut Studio? Any suggestions about the process to change the RI but keeping the same diagram design?

Thanks in advance.

Regards,
Mongui

[Lowjiber]

The Refractive Index is “nice to know stuff” when it comes to searching the various databases of designs. However, the Critical Angle (CA) of your material is really what matters. Always cut the pavilion mains above the CA.

Here’s a handy-dandy chart that shows the RI & CA for the most common gemstones, along with the “suggestions” for the mains from three different reference books…
Gemstone Faceting Angles

Be sure to read the notes below the chart!!!

As far as how to change GCS, it’s pretty straight-forward…

Take an SRB for example with P1 = 42.5 & P2 = 41.5 (one degree less). If you want to increase the critical angle after examining the above chart, just click on the P1 tier and “Edit Tier”… That will allow you to change the angle and depth using the sliders on the right side of the application. Then do the same for P2, just making its angle “one degree less”, etc. Same goes for the crown mains, etc.

There is actually a better way to make ALL of the tangent ratio changes at once in GCS, but it involves using the “Manual Optimizer” after setting the RI in the “Render” panel. Study the tutorial PDF for GCS and practice a bit… it’s great.

[Dennis Anderson in sunny Southern California]

After opening the design you wish to change in GCS, select the RENDER button and leads you to a screen that allows you to select a different material that you cut in the same design. Now return to the main screen and select Tools then manual optimizer. You now see what the original design looks like in the new material. If you don’t like it, you can now use the Manual Optimizer to change it to suit you. GCS will change the angles for the whole stone depending on the changes that you make. Now you have a design that looks the same but gives the performance you want in the new material. You often don’t really need to change the angles for a different RI if the RI is greater than the original gemstone’s value.

[mongui]

Hello @Lowjiber and @dennisanderson,
Thank you very much for your information I’m going to keep it close and use it.
Really appreciate your help!!!
Regards,
Mongui

[caseytrump]

Gem Cut Studio has a new updated version called 1.1. It Has some new features available for determining New RI functions. We all owe Justin K. Prim a big thanks for his role in Beta testing this software! He spent alot of time and effort making these revisions available to everyone through his Gemcut Studio presentation sponsored by The Asian Institute of Gem Trading in Bangkok Thailand! Thank You MR. Prim! Very well done!

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