Yeah, black cards are probably your best bet here. Try taping something black to the "ceiling" of your light tent. Also, setup the shot and then hold a black piece of card stock in different areas while looking at the viewing window to see which positions remove the right amount of glare. I've also found that photographing beads against a white background (assuming they are laying down and light cannot pass through from all sides) allows light to pass through them and show more depth.
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Annie
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