LASER DRILL HOLE:
A pinpoint hole on the surface of a diamond that leads to a microscopic tunnel that has been drilled into a diamond.
Laser Drill Holes: a tiny tube made by a laser; the surface opening may resemble a pit, while the tube usually resembles a needle.
Needles: needle-shaped included crystals.
Pinpoints: areas of minute, dot-like inclusions.
Laser Drill Hole
A Laser Drill Hole is a hole or tube left behind after a Diamond has been Laser Drilled to remove or burn out a sightly Inclusion.
Pinpoint ...
Laser Drill Hole
A tiny tube created in a diamond by a laser drilling.
Laser Drilling ...
laser drill hole (LDH) Used to make an inclusion accessible to the surface of the diamond so a strong acid solution can be introduced to lighten or partially remove the darkness.
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Laser drill holes - Tiny holes drilled into diamonds with a laser beam to dissolve or chemically reduce black spots. The enhancement is permanent, therefore legitimate, but must be disclosed.
Fig 39 Laser drill hole showing cleavage cracks perpendicular to it and a funnel-like opening (20 x)
Fig 39a As Fig 39 but 40 x
Fig 40 Three laser drill holes showing definite cleavage
cracks (10x) ...
Through the laser drill hole, acids or other chemicals may be used to dissolve away the inclusion leaving a void. The holes in the stone are extremely tiny smaller than one 1000th of an inch in diameter.
Spring 1973, Attitudes toward laser drillings, p. 144, 2pp.
Winter 1973, Many laser holes in one diamond, p. 230, 2pp.
Winter 1976, Seventeen laser drill holes in one diamond, p. 124, 1p.
 See also: Diamond, Stone, Laser, Drill, Inclusion
  
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