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Typical refractive index values gemstones – Xylem E-Line Gemological Refractometer User Manual

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Typical refractive index values gemstones | Xylem E-Line Gemological Refractometer User Manual | Page 6 / 8 Typical refractive index values gemstones | Xylem E-Line Gemological Refractometer User Manual | Page 6 / 8