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Test Your Gem IQ   Answer these questions correctly and you will win a gem screensaver.
1. A laboratory grown version of this gemstone can be seen in your supermarket checkout line: it is so durable that it is used to protect the laser scanner from the thumps of canned foods without scratching:
  Sapphire
  Quartz
  Iolite
  Diaspore
2. In Thailand, the temple Wat Phra Kaeo features the Emerald Buddha, a powerful image carved of this gemstone:
  Nephrite
  Jadeite
  Emerald
  Malachite
3. Which of these gemstones will scratch quartz?
  Peridot
  Tanzanite
  Demantoid Garnet
  Topaz

Yes, these are my final answers!

 
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