15. Gem Treatments and Value Addition

Welcome to your Module 15 - Gem Treatments and Value Addition

1. What is the primary purpose of bleaching gemstones?

Quiz: Gem Treatments and Value Addition

- A) To remove inclusions

- B) To lighten or remove undesirable colors

- C) To enhance clarity

- D) To add color

2. Which agent is commonly used in the bleaching process of gemstones?

- A) Hydrogen peroxide

- B) Acetone

- C) Alcohol

- D) Sulfuric acid

3. What does dyeing do to a gemstone?

- A) Enhances transparency

- B) Alters or enhances color

- C) Adds internal clarity

- D) Removes surface blemishes

4. Which of the following is NOT a common dyeing method for gemstones?

- A) Immersion

- B) Injection

- C) Spraying

- D) Vacuum deposition

5. What is the main effect of coating on gemstones?

- A) To change the gemstone’s internal structure

- B) To enhance or protect the surface appearance

- C) To improve internal clarity

- D) To increase the gemstone’s weight

6. Which material is commonly used for coating gemstones?

- A) Plastic

- B) Metallic films

- C) Wax

- D) Clay

7. What is the goal of impregnation in gemstone treatments?

- A) To change the color of the gemstone

- B) To fill internal pores and enhance durability

- C) To polish the gemstone’s surface

- D) To remove surface coatings

8. Which material is commonly used in impregnation treatments?

- A) Resin

- B) Dye

- C) Glass

- D) Foil

9. Fracture filling is used to address what specific issue in gemstones?

- A) Color enhancement

- B) Internal cracks or fractures

- C) Surface scratches

- D) Weight increase

10. What type of material is typically used for fracture filling?

- A) Liquid glass

- B) Silicone

- C) Resin

- D) Polishing compound

11. What is diffusion treatment primarily used for in gemstones?

- A) To improve internal clarity

- B) To enhance or change the color

- C) To remove surface blemishes

- D) To increase gemstone weight

12. Which of the following is a common result of irradiation treatment?

- A) Increased internal clarity

- B) Enhanced or changed color

- C) Improved surface texture

- D) Increased gemstone hardness

13. Laser treatment is typically used to modify what aspect of gemstones?

- A) Internal inclusions

- B) Surface color

- C) Weight

- D) Chemical composition

14. HPHT treatment is used to simulate conditions found in which part of the Earth?

- A) Crust

- B) Mantle

- C) Core

- D) Surface

15. What is the primary goal of heat treatment in gemology?

- A) To change gemstone weight

- B) To alter or enhance color and clarity

- C) To increase gemstone size

- D) To improve surface hardness

16. Which type of furnace is used for HPHT treatment?

- A) Kiln furnace

- B) Vacuum furnace

- C) High-pressure reactor

- D) Induction furnace

17. What is the purpose of geuda classification?

- A) To determine the quality and potential for treatment of rough sapphires

- B) To identify different gemstone types

- C) To assess gemstone clarity

- D) To classify synthetic gemstones

18. What does geuda heat treatment aim to improve in geuda sapphires?

- A) Internal inclusions

- B) Surface texture

- C) Color and clarity

- D) Weight

19. Which type of furnace is commonly used for heat treatment of various gemstones?

- A) Induction furnace

- B) Kiln furnace

- C) High-pressure reactor

- D) Vacuum furnace

20. Which gemstone variety might be heat treated to improve its appearance?

- A) Amethyst

- B) Opal

- C) Turquoise

- D) Amber

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