1 pcs Blue, Violet Tanzanite - 9.13 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

ALGT カラードストーン識別レポート

IDENTIFICATION
Species ......................................................................................................... Natural Zoisite
Variety ..................................................................................................................... Tanzanite
DESCRIPTION
Shape & Cutting Style ......................................................................... Oval, Mixed Cut
Measurements .................................................................... 13.52 x 10.51 x 7.95 mm
Carat Weight ...................................................................................................... 9.13 Carat
Color ..................................................................................... Vivid/Deep Blue (Violetish)
Transparency .................................................................................................. Transparent
ADDITIONAL GRADING CHARACTERISTICS
Origin ......................................................................................................................... Tanzania
Origin determination is an expert opinion based on microscopic examination, spectroscopic features and
chemical trace element analysis.
COMMENTS
Tanzanite is commonly heated at low temperature to improve its color.
There is currently no scientific method available to determine whether this
gemstone has been enhanced or not.
Moderate amount of clarity enhancement in fissures.
Clarity enhancement has become a common practice in trade for many
gemstones. This enhancement is reversible at any time.
13 November, 2025
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