Make a diskish bead of opaque, poke holes around its circumference and cover each hole with a dot of clear. Melt in, and then put another wrap or two of more clear on top of the disk. Melt into a bead, add caps of opaque if you want.
Very vague guess as I have never made, seen, or attempted to make an apple core bead.
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GTT Mirage, GTT Lynx, Smith's Little Torch
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