How can you tell real pearls from fake?

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Tags

1. #examine
2. #surface
3. #jeweler
4. #typically
5. #fakes
6. #smooth
7. #probably
8. #glass
9. #likely
10. #rough
11. #pearl
12. #while
13. #friction
14. #pearls
15. #against
16. #loupe
17. #lightly
18. #gritty
19. #sandy
20. #magnifying
21. #another
22. #using
23. #slightly