What do the abbreviations mean?

[gemcutter1]

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

[Alan Balmer]

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.

[Author]

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