Jim Brokow suggested a light tent, and Daan suggested diffusers, to help
reduce reflections when photographing gems. Yet another possibility to
consider is using cross-polarization with your flashes. See a photo of
amathest crystals photographed with cross-polarized flashes in George
Lepp's "Beyond the Basics. Innovative Techniques for Outdoor/Nature
Photography," p. 41. I use cross-polarization with good results to
photograph insects and spiders (OM4T, 2 T32's, 50mm or 38mm macro OM
lenses).
Dean
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