16. Which gemstone is known for its purple color and is associated with February?
a) Emerald
b) Sapphire
c) Opal
d) Amethyst
Answer: d) Amethyst
17. What is the traditional unit of weight for gemstones?
a) Carat
b) Gram
c) Ounce
d) Pound
Answer: a) Carat
18. Which gemstone is known for its orange color and is associated with November?
a) Emerald
b) Sapphire
c) Topaz
d) Citrine
Answer: c) Topaz
19. Which organization is responsible for certifying the authenticity and quality of gemstones and diamonds in India?
a) GIA (Gemological Institute of America)
b) BIS (Bureau of Indian Standards)
c) IGI (International Gemological Institute)
d) GJEPC (Gem & Jewellery Export Promotion Council)
Answer: d) GJEPC (Gem & Jewellery Export Promotion Council)
20. What is the process of setting gemstones into metal jewellery called?
a) Prong setting
b) Filigree
c) Granulation
d) Cloisonné
Answer: a) Prong setting
