36. Which gemstone is known for its white, iridescent sheen and is associated with June?
a) Moonstone
b) Sapphire
c) Opal
d) Alexandrite
37. Which organization is responsible for setting international standards for colored gemstones?
a) GIA (Gemological Institute of America)
b) BIS (Bureau of Indian Standards)
c) IGI (International Gemological Institute)
d) GJEPC (Gem & Jewellery Export Promotion Council)
38. What is the process of coating a metal surface with a thin layer of another metal called?
a) Electroplating
b) Filigree
c) Annealing
d) Forging
39. Which gemstone is known for its greenish-blue color and is associated with March?
a) Emerald
b) Sapphire
c) Aquamarine
d) Garnet
40. What is the term for a gemstone that has been shaped and polished, but not faceted?
a) Cabochon
b) Faceted
c) Tumbled
d) Rough
