This is how well the diamond’s facets (mirrors) align with each other in 3D. Precision components include optical symmetry (uniformity of patterning, such as the “Hearts & Arrows” pattern seen in precise round brilliants) and the degree of crispness of those patterns. The benefits of high precision are increased contrast values, purer spectral colors during scintillation and improved performance in low-light conditions.
Precision is a young aspect of cut that became possible in the 1980s and 1990s in rounds and is only now surfacing in fancy shapes. Achieving top precision requires the most modern tools, extra time and higher skill sets to accomplish. The level of precision can be seen by using an Optical Symmetry or “Hearts & Arrows” viewer.
For more information on ASET® see Cut Performance.
For more information on “Hearts & Arrows” Optical Symmetry see Cut Precision.