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I've done a few ring jobs in my day and haven't had anywhere near that much on a 6cyl or 8cyl job. Gold/Brass colored won't be assembly lube or rings cutting in, in my humble opinion. Rings cutting will produce grey that you would only be able to see on the filter surface. Bearings will generally produce gold or copper colored glitter... on the 911 engine there's the rocker bushings, valve guides and the bearings in the lower end that would produce copper/gold glitter.
Going back to the original post of the valve guides wearing excessively then I would question if the valve seat is squared with the guide as dimensionally true. If the valve is slightly cockeyed at the seat then you'll have the heavy wear. Might be time for a new machine shop for a second opinion if this turns to be guide related.
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“Of the value traps, the most widespread and pernicious is value rigidity. This is an inability to revalue what one sees because of commitment to previous values. In motorcycle maintenance, you MUST rediscover what you do as you go. Rigid values makes this impossible.”
― Robert M. Pirsig, Zen and the Art of Motorcycle Maintenance: An Inquiry Into Values
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