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Invented by Israeli scientist Zvi Yehuda in Zvi Yehuda Diamond Colorimeter
| Feature | Zvi Yehuda Colorimeter | Modern Spectrophotometer (e.g., X-Rite) | GIA GemSet (Visual) | | :--- | :--- | :--- | :--- | | | $4,000 - $8,000 (Used/Vintage) | $15,000 - $40,000 | $10,000+ (Plastic masters) | | Speed | Slow (30-60 sec/stone) | Instant (1 sec/stone) | Slow (Comparison) | | Subjectivity | Low (Machine objective) | Very Low | High (Human eye) | | Output | Hue/Tone/Saturation (HSL) | L a b* (CIE) | Letter grades (G to VV) | | Best For | Immersion body color | Faceted surface color | Rough sorting | zvi yehuda colorimeter
: Typically show a 100% blue fluorescence under specific test conditions. Invented by Israeli scientist Zvi Yehuda in Zvi
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