Thanks guys.  This is what I came up with as a possible final design for the amulet.

The knot object itself was created directly inside 3dsmax, with the assistance of a Maxscript that uses algebraic formulas and parameter input.  The results are output as geometry, and can then be modified with standard polygon tools, or modifiers.  I created the knot with the script first, but also added further modification with traditional poly tools.

The new inset circular piece was generated from a hemisphere, and is close to the design I'm looking for.  I was considering using maps for the additional details, but the more I can do geometrically, I think, the better.  Thinking about it yet again, I might change that middle piece at the last minute, but for now I'm somewhat satisfied with it.

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