Color (2) Gemologists (2) Color (2) zonage (1) spectacle (1) région (1) papier (1) matériaux naturels (1) matériau (1) séparation des masses (physique) (1) laser (1) eau douce (1) demande (offre et demande) (1) couverture (1) Case (1) Methods (1) Identification (1) Origin (1) Zoning (1) White (1) Value (1) Resonance (1) Raman spectroscopy (1) Raman effect (1) Pigments (1) Pearls (1) Paper (1) Measurement (1) Infrared spectroscopy (1) Identification (1)