In the previous tutorial, we looked at how to take pictures of diamonds whether it was for aesthetics or for online assessment. I concluded that it was very difficult to take a picture that is good enough for the purpose of forming a valid assessment of a diamond’s light performance and optical symmetry. In today’s tutorial, I am going to look at how difficult it is to take … [Read more...]
Star Facet
In the previous tutorial on the lower girdle, I showed you how the length of the star facets help us make an educated guess about the length of the lower girdle. However, the star facets can also help us make an educated guess about size the table facet as well. For a diamond with 50% stars and 60% table, the table edge will line up with the edge of the star facet forming a … [Read more...]
Idealscope and ASET
The idealscope and the Angular Spectrum Evaluation Tool (ASET) viewer are the two most important tools that you need in order to assess light performance. This tutorial is designed to help you understand what these tools are used for, how to use them properly, and how to interpret their results. It's important that you understand that the handheld versions of the idealscope … [Read more...]