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1. Hardness
2. Gubelin Gemological Laboratories
3. Glossary of Terms for Alexandrite Gemstone Buyer and Collector's Guide
4. Gemsuite
5. Gemstone cuts
6. Gemstone
7. GemResearch Swisslab
8. Gemmy Color Change Alexandrite Oval 5.08cts.
9. Gem Studies Lab
10. Gem Cut 11.7x8mm Chrysoberyl Oval 4.53cts.

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