The most fundamental variations of the SRB share the same indexes for all the facets but vary the angles with which they are cut. Design analysis done with raytracing and light modeling …

Pavilion facets cut below the critical angle will ‘window’ instead of reflecting light, which is generally an undesirable effect in a gemstone. One often sees 43 and 45 degrees published …

Dec 17, 2023 · Welcome to the Gemology Online Faceting Diagram database! All patterns on this page were written by faceters on this site. To access the diagrams, simply click on the image …

On a SRB only 4 index changes are used to cut the stone. The conversion chart for the 64 index should allow you to convert any faceting diagram for the 64 index, for example, index number …

Nov 11, 2014 · This is my interpretation of the SRB cut for 2+ RI stones using the US faceters guild diagram. The angles are based on the appraisal "optimal" angles for diamond. I did the …

A beautiful Arizona Peridot cut as a Standard Round Brilliant (0.5 carats at 5 mm in diameter). An SRB cut has 73 facets total, which helps to give many gems lots of sparkle and flash.

Aug 10, 2019 · The SRB cut is 42 degrees for the pavilion mains but the next time you work on a sunstone, try cutting the mains at 45 degrees and the first facet crown at 40 degrees. Adjust …

Jul 13, 2021 · Check out what happend and learn what you have to pay attention to, to avoid such annoying Mistakes. Sad that we will never find out what the finished cut and polished …

Jan 17, 2019 · Photo realistic image of today’s Ideal cut diamond. Abstract: Over more than 150 years, those involved in the diamond industry have worked to establish the ideal angles and …

Here, we will use BOG to optimize the angles for a standard round brilliant (SRB) cut in tourmaline. The Gemcad file for this tutorial, BOGTUT.GEM, is a "lowboy" variation of the SRB …