Forums Gemology Light Physics

  • Light Physics

    Posted by ScottWilliam on April 19, 2016 at 1:41 am

    Although I follow facet designs I have begun to understand just how much gemologists vary on main angles. I just finished some math involving Snell’s law and the law of refraction. Things never quite follow theory in the real world so I am trying to expand my theory. I don’t understand the mathematics behind calculating dispersion. Today I also learned about the heart & arrow effect in diamonds, does the change in pavilion angles have the same effect on gems such as corundum? I still don’t fully understand gemstone design and how to fully take advantage of dispersion. Could anybody give some good personal input or share articles.

    Justin Prim replied 6 years, 1 month ago 3 Members · 2 Replies
  • 2 Replies
  • Alan Balmer

    June 30, 2016 at 10:34 pm

    Scott, I missed this when you first posted it. I’m no expert on the subject*, but I know someone who is.

    Get Tom Herbst’s books “Amateur Gemstone Faceting”, available at Amazon. What you’re looking for is in Volume 2, but get Volume 1, as well.

    *Though I did struggle through Born and Wolf’ “Principles of Optics” when I was a young lad.

  • Justin Prim

    May 28, 2018 at 10:06 am

    There is a section here called Light Performance Articles that I think you will enjoy.

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