Professional Jeweler Archive: Gemstones and Pearls Quick Quiz

December 2003

Gemstones & Pearls/News

Gemstones & Pearls Quick Quiz

New sources, treatments and cuts were discovered over the past year. Test your knowledge. All information was culled from the pages of Professional Jeweler.

1. New sources of sapphire were discovered in:
  1. Tierra del Fuego
  2. Molepolole, Botswana
  3. Madagascar
  4. Disputed regions in Kashmir

2. One gemstone the island of Sri Lanka is not known for:

  1. Moonstone
  2. Jadeite jade
  3. Ruby
  4. Sapphire

3. Emeralds are increasingly in demand because:

  1. There’s greater confidence in treatment options.
  2. Zambia and Brazil are adding to Colombian supply.
  3. Other gems’ hard-to-detect treatments make emerald fixes seem benign.
  4. Demand is cyclical and they’re due for a “moment.”

4. An emerging source of jadeite jade:

  1. Nebraska
  2. Tierra del Fuego.
  3. Guatemala
  4. Your store

5. Scientists say an easy way to separate parcels of lattice-diffused orange sapphires includes:

  1. De Beers’ DiamondSure and DiamondView machines.
  2. Pelting them against a wall and hearing a hollow sound.
  3. Seeing what kind of Newton rings they make.
  4. Exposing them to longwave UV light in a darkened room and looking for unusual orange fluorescence in colorless areas of the stone.

6. Bulk lattice-diffused sapphires are treated with:

  1. A high-temperature treatment during which a foreign element is introduced into the atomic structure of the gems, causing color change.
  2. A photographic technique.
  3. Oregano and cardamom during the “cooking process.”
  4. Gentle heat exposure and rubbed-in tanning compounds.

7. A new source of emeralds was discovered in:

  1. Hiddenite, NC.
  2. The Yukon Territory, Canada.
  3. Austin, TX.
  4. Quillacollo, Bolivia.

8. Cultured pearl production in 2003 increased in all categories except:

  1. Congolese cultured saltwater pearls.
  2. Chinese freshwater cultured pearls.
  3. Japanese akoya cultured pearls.
  4. Tahitian black cultured pearls.

9. This type of coral is likely to be added to the CITES endangered species list because of over-harvesting and little to no marine management:

  1. Pink corallium rubrum.
  2. Snail coral.
  3. Reconstituted coral.
  4. Organic coral.

10. At the 2004 International Colored Gemstone Association Congress, all but one of these topics was discussed:

  1. The promotion of colored gemstones.
  2. Colored gemstone communication systems.
  3. Using diamonds as a guide to promote colored stones.
  4. Gemstones as gifts for children, dogs and other creatures.


1-C (April, p. 30)
2-B (June, p. 48)
3-A, B, C, D (October, p. 35)
4-C (April, p. 30)
5-D (November, p. 36)
6-A (May, p. 36)
7-B (October, p. 37)
8-C (August, p. 37)
9-B (August, p. 36)
10-D (March, p. 35)

Copyright © 2003 by Bond Communications