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I would like to ask the audience here for opinions/experience as to what the best kind of stringing material would be for a knotted gemstone necklace. The beads are ~6mm tiger eye and hematite, and the holes are good for about 20ga wire to give you an idea of the size. The necklace will be a touch heavy, as you might guess, and will be worn almost continuously.

Thanks in advance for your suggestions.