Half-drilled bead Beads with a hole that goes only half-way through, instead of all the way through like a normal bead. There are many findings that are made to take a half-drilled beads, like ring settings and earring posts.
Half-Drilled Bead: A ball with a hole drilled only half way through.
Hat pin: Long metal pin with an ornamental head used to fasten a woman's hat by passing the pin through her hat and hair.
Head: See "Setting." ...
Half-drilled
Pearls which have only been partly drilled, as for rings or earrings.
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Half-drilled
A pearl that is half-drilled, often used for rings or earrings,
Haliotis ...
Fall 1950, Reverse Pattern on Half-Drilled Black Pearls, p. 353, 1p.
Fall 1950, Artificial Pearls Made By New Process, p. 353, 1p.
Winter 1951, Gem Trade Lab Gets New Pearl X-ray Machine, by Benson, p. 107, 6pp.
A half-drilled Pearl, as the name implies has a hole drilled from the surface to the center so the pearl may be cemented to a metal post to permanently secure it to the finished piece of jewelry.
 See also: Color, Bracelet, Earring, Drill, Cut
  
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