GCAL reports emphasize light performance and optical precision. If you care about sparkle consistency, this is a useful supplement to a standard grading report.
At a glance
- Best for: light performance shoppers
- What it includes: 4Cs, light performance analysis, optical symmetry
- Watch for: report terminology differences vs GIA
How to use it
Use the light performance section to shortlist stones, then confirm with an in-person look under neutral lighting. Match the report to your setting style so a high-crown stone is not forced into a low-profile setting.
Pair this with the Ring Settings guide if you are choosing a low-profile or protective design.
