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Occult Paranormal

By Joel E. Arem

This booklet might be of curiosity to gemologists gem creditors jewellers gem cutters gem purchasers an individual drawn to gems.

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Extra resources for Encyclopedia of Gemstones

Example text

7 4. 9 10. 3 7. 4. 1 6. 1R2. 1 5. 2. 8 7. 3 6 2. 29 dark orange brownish-pink 2. 5 9. 8 8. 6 6. 8 8. 2 -169 7. 2 6. 9 1 Brazil Blues and Greens dark pinkish-red intense smalt blue blue-green fine green 9. 3 2.

9RP2. 6RP3. 8 9. 6RP4. 9 3. 3 9. 6 2. 7PB4. 4 blue medium blue dark blue violetish-pink dark lemon yellow medium green Sri Valley, 8. 7 3. 56 round Umba Valley, 6. 9 Tanzania [continued] COLOR MEASUREMENT AND SPECIFICATION 30 TABLE 2. 87 emerald cut emerald cut round emerald cut round round Mexico Tasmania South Africa 60 33 Turkey New York Kenya 69 72 36 antique USSR 10 emerald cut Tsumeb, 28 pear octagon pear shield pear pear shield 75 70 . 9 6. 5 6. 8 4. 7 4. 8 7. 5 3. 1 4. 6 6. 0 7. 2 4. 7GY 5GY 3.

Also, the refractometer effectively measures all indices of refraction (that is, for all light wavelengths) simultaneously; more accurate measurements can be made wavelength single is selected. This is be the spectral (yellow) line known as D, which teristic of the Light if only a universally taken to is charac- emission spectrum of sodium. may be absorbed differently as it passes through a crystal in different directions. Sometimes the differ- ences are only in degree of absorption or intensity.

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Encyclopedia of Gemstones by Joel E. Arem

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