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Barbara, you might try a trick that was posted some time back for
photographing Opal. Get a large white Corning ware dish that you
can lay your necklace out on. Position the piece in the dish as you
want. Then fill the dish with enough water to cover the piece. You
might add just a drop of two of dish soap to break the surface
tension and prevent bubbles on the piece. You can now set up the
lights and camera so there is no glare off the surface of the water.
You now have a fully lighted piece with no bright spots. The only
problem is that this method destroys the brightness of faceted
stones. It works great for cabs though.