GemData Welcomes You To

June 1997 Gem Quiz

This is a multiple choice quiz to test your knowledge of Colored Gemstones, Diamonds and the Gemstone Trade. Choose the best answer for each question from the available answers.

This quiz is to sharpen your skills and expertise of the Gemstone Industry. Sorry, you will not receive any prizes for completing this quiz, just the joy of learning. Have fun.


  1. The refractometer, when used properly with a monochromatic sodium light source, may yield a birefringence value for opal of 0.024?
      True
      False

  2. Refractometer testing for the optic sign of the gemstone spinel may yield biaxial positive results?
      True
      False

  3. The refractometer, when used properly with a monochromatic sodium light source, may yield a birefringence value for topaz of 0.009?
      False
      True

  4. Brown/Tan is a color associated with the long wave ultraviolet excitation of the gemstone chalcedony?
      False
      True

  5. Orient is a phenomena associated with the gemstone chrysoberyl?
      False
      True

  6. The polariscope may yield aggregate results when testing the gemstone beryl?
      False
      True

  7. Synthetic rutile is said to have moderate dispersion?
      False
      True

  8. Andalusite has a scarlet red streak plate test response?
      False
      True

  9. Pyrope is found commonly in an opaque form?
      False
      True

  10. Andalusite is said to have very strong dispersion?
      True
      False

  11. The refractometer, when used properly with a monochromatic sodium light source, may yield a birefringence value for synthetic corundum flux of 0.009?
      False
      True

  12. Refractometer testing for the optic sign of the Cubic gemstone spinel may yield uniaxial results?
      False
      True

  13. Cubic Zirconia is found commonly in an opaque form?
      True
      False

  14. Moldavite commonly can exhibit either splintery and/or step-like fracture characteristics?
      False
      True

  15. The Moh's hardness of turquoise is approximately 5.9?
      False
      True

  16. The gemstone jadeite (GIA) exhibits a characteristic weal band at 433 nanometers?
      False
      True

  17. The gemstone synthetic emerald flux exhibits a characteristric strong band at 427 nanometers?
      False
      True

  18. The gemstone synthetic rutile exhibits a characteristric weak doublet at 425 nanometers?
      False
      True

  19. Synthetic Emerald Hydrothermal can show a moderate trichroic pleochroic response when carefully tested with a dichroscope?
      False
      True

  20. The gemstone synthetic emerald flux exhibits a characteristic weak line group at 427 nanometers?
      False
      True


GemData will continue to have a future Gem Quiz each month. Would you like to see your questions used for a future Gem Quiz? GemData will be happy to post the persons name who submitted the question if so desired. Please submit your questions on any subject to do with the Gem, Diamond or Jewelry Industry with the answers to Lance Kanaby at lkanaby@buffnet.net


Copyright 1996-1997 GemData Corp., All rights reserved. Last Updated: Thursday, June 12, 1997