1. What geological process primarily forms natural inorganic gemstones?

2. Which trace element gives rubies their red color?

3. What is the hardness of a diamond on the Mohs scale?

4. Which property is commonly exhibited by tanzanite?

5. What phenomenon is alexandrite known for?

6. Benitoite is primarily found in which location?

7. What technique is used to measure the refractive index of a gemstone?

8. What property is unique to each type of gemstone and aids in identification?

9. Which gemstone exhibits pleochroism?

10. What does X-ray diffraction (XRD) analyze in a gemstone?

11. Which tool is commonly used for magnification in gemology?

12. What is specific gravity a measure of?

13. What does spectroscopy analyze in gemstones?

14. What type of gemstone is sapphire?

15. Which gemstone is known for its high dispersion and intense sparkle?

16. Which element is responsible for the green color in emeralds?

17. What property is measured using a birefringence test?

18. What is the main use of X-ray fluorescence (XRF) in gemology? -

19. How are rare gem minerals typically identified? -

20. Which natural inorganic gemstone is known for its exceptional hardness and brilliance?