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| Color origin of phenakites from the Ural emerald mines | 486 |
| April 2026 | May 2026 | June 2026 | July 2026 | August 2026 | September 2026 | October 2026 | |
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| Color origin of phenakites from the Ural emerald mines | 11 | 9 | 7 | 17 | 11 | 10 | 2 |
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| F_Spring_2018_Gems_Gemology.pdf | 380 |
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| Russia | 176 |
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| Kazan | 176 |