why would we u se tanzanite gem stone

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 why would we u se tanzanite gem stone 


The dichroscope separates the polarized rays so that they may be observe side by side.

Procedure:

  1. Place the gemstone on the rotating platform of the dichroscope holder table down.
  2. Direct light onto the gemstone.
  3. View the stone through the dichroscope.
  4. Slowly turn the rotating stage so as to view to all directions.
  5. Look for different colors or shades of the color.

Factors:

  1. Dichroism is only seen in “Doubly Refractive” gemstones.
  2. It is not seen in gemstones that display “Anomalous Birefringence”.
  3. Maybe very weak or even undetectable.
  4. Not seen in colorless doubly refractive gemstones or along an optic axis.
  5. Exact colors are not important.
  6. Helpful in distinguishing:
  • Blue Sapphire from Synthetic or Natural Blue Spinel.
  • Ruby from Garnet or Spinel.
  • Emerald from Demantoid or Tsavorite Garnet.
  • Any doubly refractive gemstone (i.e. Amethyst) from Glass.

Dichroism can also be use in color grading color gemstones.

i.e. Blue Sapphire describe as Greenish/BLUE

Dichroism can also be detect by using a polarizing filter. If it is rotated against a gem, first one color will be seen (caused by one polarized ray) and then another. It can also be seen simultaneously by using a piece of suitably cut polaroid.

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