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Tanzanite treatment
Tanzanites are heat-treated to produce colors that include light to dark violetish blue and bluish purple, as well as pure blue. Rich, deep blues are valued most, but you'll usually see these only in stones weighing 5 cts. or more. This is mainly because of decisions made during the cutting process. Tanzanite typically shows strong pleochroism, which means it displays different colors from different directions. It usually looks violetish blue from some directions, purplish from others. Tanzanite Propertise
Tanzanite is special-care gem for two reasons: sensitivity to thermal shock and the potential for cleavage. Sometimes the temperature change between the hot lights of the display case and the chilly glass countertop in an air-conditioned showroom can be enough to develop cleavages in tanzanite.
Because of its susceptibility to cleavage, tanzanite shouldn't be handled carelessly. Active people should consider jewelry that won't be exposed to as many bumps — pendants and earrings are good choices.
Hardness & Toughness
Sudden changes in temperature may cause cracking in tanzanite. The gem is stable to light, and can be attacked by hydrochloric and hydrofluoric acid.
Care and Cleaning
Tanzanite should be cleaned using warm, soapy water. Ultrasonic cleaners and steam cleaners should never be used.
Imitations
Glass, synthetic corundum, synthetic spinel, and synthetic spinel triplets have all been used to imitate tanzanite.
Reference:
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