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Also for photographing watches use a light box, you can buy them online or do what I done and made my own.
Basically get a cardboard box, cut three square holes in it, one at the top and one either side, cover these holes with some baking parchment/grease proof paper. Then get a couple of torches or lamps and shine these through the holes, you get great light with no shine or glare on the crystals of watches.