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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. What property of gemstones enables them to be separated or "panned" from alluvial gravels?
  Hardness
  Luster
  Specific Gravity
  Refractive Index
3. What kind of gemstone was sought in the movie "Romancing the Stone"?
  Tourmaline
  Ruby
  Sapphire
  Emerald

Yes, these are my final answers!

 
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