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2 | is one of the | | | | | | | 3 | 0.45% |
3 | diamond council of america | | | | | | | 3 | 0.45% |
4 | texas institute of jewelry | | | | | | | 3 | 0.45% |
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22 | gemological institute of america | | | | | | | 2 | 0.30% |
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27 | international gemological institute international | | | | | | | 2 | 0.30% |
28 | gemmology diamond council of | | | | | | | 2 | 0.30% |
29 | council of america dca | | | | | | | 2 | 0.30% |
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32 | about gemology school reviews | | | | | | | 2 | 0.30% |
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39 | sciences birmingham city university | | | | | | | 2 | 0.30% |
40 | gemological institute international gem | | | | | | | 2 | 0.30% |