Twinning lines in Diamond
Diamonds have the property of growing together into twin crystals.
Twinning Lines or Wisps - Visible line on or with in a fashioned diamond, caused by twinning in the crystal.
twinning lines See graining lines.
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U.L. rated safe Underwriters Laboratories tests safes (among many other products) for their resistance to tools and torches. Insurance companies will require a U.L.
Spring 1951, Repeated twinning lines seen in synthetic corundum, p. 25, 1p.
Fall 1952, Oriented Lines in Synthetic Corundum, by W. Plato, p. 223, 2pp.
Summer 1957, Synthetic white colorless corundum as diamond substitute, p. 57, 2pp.
or growth defects, grain lines frequently look like polishing lines, except that they can cross facet junctions, while polishing lines cannot; they usually cannot be removed by recutting or polishing. Also called knot lines and twinning lines.
Such material is rather easy to distinguish from natural material by the presence of curved growth striations and spherical gas bubbles or by the Plato method, in which repeated twinning lines appear when the material is immersed in high R.I.
 See also: Inclusion, Inclusions, Table, Diamond, Crystal
  
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