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78 78 Alluvial Mining 81 Marine Mining 82 Open-Pit Mining 86 Underground Mining 92 Diamond Sorting Chapter 4: The Evolution of Diamond Cutting
Travel Lab for the Professional Gemmologist
Each chapter contains photographs that show the unique physical characteristics of the diamonds
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Optivisor - Lens Plates Setting Tools 78 78 Alluvial Mining 81OptiVISOR lenses are manufactured from high quality optical glass prepared toopthalmic standards. Itemnr. Magnification Focal Length #2 1,5 times 20" or 51 cm #3 1,75 times 14" or 35,50 cm #4 2 times 10" or 25 cm #5 2. 5 times 8" or 20cm #7 2,75 times 6" or 15cm #10 3. 5 times 4" or 10cm
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