It really depends on how many lights you have to work with. If only two, you'll want them to the sides, and a little higher than the object being photographed. Add a third light and generally you'll want it above the subject while the other two remain to the side and slightly above. A forth is usually not necessary, but sometimes comes in handy to provide extra illumination up front if the object is on the dark side.
I haven't found a single lighting setup that works for everything yet and doubt I will. Sometimes you just have to experiment in order to get good illumination without too much reflection.
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