Updated
Diamonds
Diamond Cut Proportions Calculator
Analyze table %, depth %, crown and pavilion angles, girdle and culet, plus star and lower-half facets. Screen round brilliants and fancy shapes, estimate spread, and compare proportion sets.
Cut Proportion Analyzer, Screening Score & Comparison
Enter millimeter measurements and angles from a grading report (or listing) to calculate proportions, flag extremes, and get practical guidance on what to check next.
Estimates for crown height and pavilion depth are simplified geometry to help intuition. Real light performance depends on full facet design and optical precision, so use these results as screening, not a guarantee.
Fancy shapes vary widely by design. Use these results to screen for spread and extremes, then rely on high-quality video/images and real appearance (bow-tie, windowing, edge brightness) for the final decision.
Comparison is intentionally simplified to help shortlist. If the scores are close, let the final decision be driven by cut grade, images/video, optical symmetry, and what looks best to you.
Lot checking helps quickly identify whether a batch trends deep, shallow, or inconsistent. For accurate purchasing decisions, still verify individual stones and confirm with imagery and grading details.