The heating process has no effect on the
initial color of Tanzanite. Only the red/brown axis is removed, leaving the blue/violet hue
alone. It should be noted that if the original Tanzanite already has a deep blue hue, the
heat will not change its color. Tanzanite's color is primarily determined by the Titanium to
Vanadium ratio in its crystal structure.
The heating process of Tanzanite
triggers a valence exchange reaction (redox reaction), which improves the purple and blue
colors while leaving the titanium colorless. It is difficult to objectively check the nature
of Tanzanite treatment, whether naturally or artificially heated. Actually, science has
reached its maximum in terms of this matter, it has become even harder to determine these
different treatments. However, the final price will not be affected despite the fact that
they are heated in different ways.