N. 103147244

6 pcs Blu, Viola Tanzanite - 5.13 ct - Antwerp Laboratory for Gemstone Testing (ALGT)
N. 103147244

6 pcs Blu, Viola Tanzanite - 5.13 ct - Antwerp Laboratory for Gemstone Testing (ALGT)
15 january, 2026
48939628
algt colored stone identification report
identification
species ................................................................................ natural zoisite
variety ............................................................................................ tanzanite
description
shape & cutting style ...................... modified octagon, step cut
total carat weight .................................................................. 5.13 carat
color ........................................................................ intense purplish blue
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
total 6 stones. average carat weight: 0.85 ct.
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.
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