1. What is the primary purpose of using nonvisible radiation in gemology?

2. Which of the following is NOT a type of nonvisible radiation?

3. What type of UV light is most commonly used in gemology?

4. What is the main difference between fluorescence and phosphorescence in gemstones?

5. What is a typical result of using an ultraviolet lamp on a natural diamond?

6. X-ray Diffraction (XRD) is primarily used to:

7. Thermal conductivity probes are especially useful in distinguishing:

8. Which of the following gemstones is known to exhibit strong blue fluorescence under UV light?

9. Electrical conductance probes are primarily used to detect:

10. Reflectance meters measure the:

11. Ultraviolet (UV) light is part of the visible spectrum.

12. Phosphorescence in gemstones continues to emit light after the UV light source is removed.

13. X-rays can be used to identify inclusions within gemstones.

14. Fluorescence is the emission of light by a substance that has absorbed light, and it continues even after the light source is removed.

15. Thermal conductivity probes can differentiate diamonds from their simulants.

16. Reflectance meters are used to measure the electrical conductivity of gemstones.

17. X-ray Fluorescence (XRF) is used to determine the chemical composition of a gemstone.

18. Synthetic gemstones never exhibit luminescence under UV light.

19. Electrical conductance probes are useful in identifying moissanite because moissanite has different electrical properties compared to diamonds.

20. Handheld ultraviolet lamps are commonly used in the field for quick gem identification.