Asscher Proportion Checker
Screen report numbers, identify outliers, and keep visual performance separate from proportion rules
A screening tool—not a cut grade
Enter the grading-report measurements and finish grades. The checker compares them with AsscherDiamond.com’s documented editorial starting zones. It cannot determine beauty, light performance or an official GIA cut grade.
Inventory changes daily—apply your filters, then judge pattern on 360° video.
Find Asschers in these proportions → Compare another stone / stay in tools
What happens after the numbers
A candidate that lands inside the preferred screening bands can still have windowing, extinction, asymmetry or a weak windmill. Your next step is always the light-performance check and pattern check.
Asscher appearance depends on the full three-dimensional facet system. A stone can sit inside broad ratio, depth and table screening zones and still show weak contrast, persistent windowing or an unattractive step pattern. Conversely, a candidate outside a broad range may still deserve inspection. Use the Proportion Reference to understand the methodology, then evaluate video or the loose diamond face-up.