Forums Beginner Questions What do the abbreviations mean?

1 reply, 2 voices Last updated by Alan Balmer 5 years, 4 months ago
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    • #5153

      gemcutter1
      Participant
      @gemcutter1

      I would like to cut the USFG-2. There are abbreviations in the diagram that I don’t understand. What does CAM mean?

    • #5154

      Alan Balmer
      Keymaster
      @alanbalmer

      For a meet-point cutting procedure, it’s often much simpler if you can generate a preform to establish the girdle outline first. The CAM (Center-point Angle Method) is a way of doing that. There’s a good explanation of this, as well as OMNI and CLAM methods, in volume 2 of Tom Herbst’s “Amateur Gemstone Faceting”.

      Other abbreviations on a gem design refer to the geometry of the finished stone, in terms of ratios. L is length, W is width, C is crown height, P is pavilion depth, etc.

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