66. What is the process of giving a metal jewellery piece a darkened or antique finish called?
a) Plating
b) Enameling
c) Oxidizing
d) Polishing
67. Which gemstone is known for its bluish-green color and is associated with March?
a) Emerald
b) Sapphire
c) Aquamarine
d) Garnet
68. Which organization is responsible for conducting gemstone and diamond auctions 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)
69. Which gemstone is known for its color-changing properties and is associated with June?
a) Emerald
b) Sapphire
c) Opal
d) Alexandrite
70. What is the term for a jewellery piece that features a single large gemstone surrounded by smaller gemstones?
a) Solitaire
b) Halo
c) Cluster
d) Cocktail
