1 pcs 紫色, 藍色 坦桑石 - 10.79 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

ALGT 彩色宝石鉴定报告
IDENTIFICATION
Species ......................................................................................................... Natural Zoisite
Variety ..................................................................................................................... Tanzanite
DESCRIPTION
Shape & Cutting Style ....................................... Rectangular Cushion, Mixed Cut
Measurements .................................................................... 14.82 x 10.94 x 7.75 mm
Carat Weight ................................................................................................... 10.79 Carat
Color ...................................................................................................... Vivid Purplish Blue
Transparency .................................................................................................. Transparent
ADDITIONAL GRADING CHARACTERISTICS
Color Quality Grade .......................................................................... Fine Color Quality
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.
Minor amount of clarity enhancement in fissures at the time of testing.
Clarity enhancement has become a common practice in trade for many
gemstones. This enhancement is reversible at any time.
07 February, 2026
62006621