Cut quality is the single most important factor determining a diamond's brilliance, fire, and scintillation, dictating how efficiently light reflects through the crown facets.
1. The 4Cs Diagnostic Breakdown
| The 4C Dimension | Evaluation Scale | Optimal Sweet Spot for Value | Visual Impact Factor |
|---|---|---|---|
| Cut Quality | Excellent → Poor | GIA Excellent / AGS 0 | Highest impact on sparkle and fire |
| Color Grade | D (Colorless) → Z (Light Yellow) | G to I (Near Colorless) | Appears icy white face-up in gold/platinum |
| Clarity Grade | FL/IF → I1/I2/I3 | VS1 / VS2 / Eye-Clean SI1 | 100% eye-clean without paying for FL premium |
| Carat Weight | Metric Carats (1ct = 0.20g) | 0.90ct or 1.90ct (Under Magic Marks) | 15–25% price savings under 1.00ct threshold |