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1. Thermolumnescence
2. Thermochroism
3. Synthetic alexandrite
4. Synthetic
5. Spinel
6. Spectrum
7. Spectroscope
8. Specific gravity
9. Simulant
10. Silica
11. Refractive index measurement
12. Reflection
13. Ray
14. Radium fluorescence
15. Radiation
16. Quoin facets
17. Quinoline
18. Quench crackled synthetic corundum
19. Quartz, cat's-eye
20. Quantum
21. Physical properties
22. Phenomenon
23. Phase
24. Perovskite
25. Pegmatite
26. Oxide
27. Orientation crystal
28. Oriental chrysoberyl
29. Optical axis
30. Opaque
31. Novosibirsk synthetic alexandrite
32. Negative reading
33. Needlelike (silk)
34. Natural
35. Moh's hardness scale
36. Mineralogy
37. Mineral
38. Mica schist
39. Metamorphic rock
40. Magma
41. Luminescence
42. Light absorption
43. Laser
44. Laminate
45. Kelvin temperature scale
46. Kashmir
47. Karat
48. Jewels of India
49. Jewelry
50. Jewel enamel
51. Jewel
52. Irradiation
53. Index of refraction
54. Inclusions
55. Inclusion in chrysoberyl
56. Incandescence
57. Inamori synthetic pulled alexandrite
58. Imitation
59. Hue
60. Host crystal

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