Sci-Five | The Hindu Science Quiz: On Gemstone
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What is the famous saying about Alexandrite’s colour change?
- Ruby by day, emerald by night
- Emerald by day, ruby by night
- Sapphire by day, topaz by night
- Opal by day, diamond by night
Alexandrite shines red in lamplight and green in sunlight; hence, the saying “emerald by day, ruby by night”.
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What is amber made from?
- Hardened lava
- Crystallized salt
- Fossilised ancient tree sap
- Compressed sand
Amber is an organic gem that is created from hardened and fossilized ancient tree sap.
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Peridot was discovered in comet dust brought back by which space probe?
- Stardust Space Probe
- Voyager 1
- Apollo 11
- Hubble
In 2005, the Stardust Space Probe returned to Earth covered in comet dust that contained peridot particles.
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Who officially named Tanzanite after Tanzania in 1967?
- Cartier
- De Beers
- Bvlgari
- Tiffany & Co.
Tanzanite was officially named after the country of Tanzania where it is found by Tiffany & Co. in 1967 when it was first unearthed.
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What is used to measure the hardness of gemstones?
- Richter Scale
- Mohs’ Scale
- Newton’s Scale
- Crystal Index
Gemstones are graded for their hardness on what is known as “Mohs’ Scale”. Amber is the softest gemstone, diamond is the hardest.
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Published – March 27, 2025 05:30 pm IST
