Fingerprint Inclusion
Liquid and/or gas or solid flaws in gemstones which align in the form of a human fingerprint.
Spring 1968, First fingerprint inclusions, first needles (in three directions) inclusions in diamond, seen at GIA, p. 278, 2pp.
Fall 1968, Sugar-cube-like inclusions under high magnification, p. 344, 2pp.
Eppler (1959) actually reproduced this process in the lab, producing fingerprint inclusions in Verneuil synthetic rubies by inserting fractured stones into hydrothermal autoclaves.
These fluxes resemble feather or fingerprint inclusions or small specks of platinum which appear to have come from the crucible on which the crystals were grown.
Many tanzanites tend to be remarkably clean and transparent. The standard is therefore eye-clean stones
Fingerprint inclusions are sometimes present
Very rare, tiny, parallel, hollow tubes in some tanzanites cause chatoyancy (cat's eye effect) ...
as synthetics go, the resultant gems have natural looking inclusions, the most notable of which are sometimes called "wispy veils". Consisting of crystalized flux within minute cracks in the gem, they are so like natural fingerprint inclusions in ...
 See also: Gemstone, Cut, Inclusion, Inclusions, Jewel
  
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