Maybe experiment with some plain beads the same size before you try it on any fancy beads.
I've scored 1" thick rod and broken it cleanly, so thickness is not the big issue. If you can get your score line neat and even on a bead, and make sure that it is clean and free of chips like Rough_necked suggested, it could work. Adding a little water to the score line helps.
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Kimberly
working glass since 1990 - melting it on a torch since 2002
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