If you are using a tripod for this then strong lighting isn't a problem because it doesn't matter if the exposure is long (use the self timer if you don't have a cable release).
You can usually flip the centre pole around and mount the camera from underneath and point it down. And with the legs on minimum you can sit it on a table at a good working height.
Then use side lighting. Either a door or window, or even a good torch will do. You can correct colour balance in software later. The idea is to limit reflections, so any light coming straight down will reflect straight back up and cause 'hot spots'.
If you set up next to a window with low sunlight coming in, then diffuse it with something. I have used a light silk-type blouse a girlfriend loaned me taped to the window [be spare with the tape. You don't want to have to tear metres of it of the fabric or the girls get a bit stroppy :-)]
A polarizer won't work for indirect, reflected, or muted light, and it will rob you of at least 1 f-stop.
If the photos are small and you don't have a macro lens, or setting, then get a +3 or 4 close-up filter.
Hope some of this is useful.
Trev
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