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Bead Hole Size Guide: How to Choose the Right Cord or Wire An 8 mm gemstone bead tells you how wide the bead is. It does not tell you what will fit through its hole. Two beads with the same outside diameter can have different hole sizes, and holes may vary slightly within the same strand. If you are planning a stretch bracelet, a clasp bracelet, or a knotted necklace, checking the hole before you start can save frustration. Start by choosing your gemstone beads, then make sure your stringing mat …