編號 101551036

1 pcs 藍色 黃玉 - 31.76 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - London Blue
編號 101551036

1 pcs 藍色 黃玉 - 31.76 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - London Blue
ALGT COLORED STONE IDENTIFICATION REPORT
IDENTIFICATION
Species .......................................................................................................... Natural Topaz
Variety .................................................................................................................. Blue Topaz
DESCRIPTION
Shape & Cutting Style ......................................................................... Pear, Mixed Cut
Measurements .................................................................. 24.29 x 16.74 x 11.13 mm
Carat Weight ................................................................................................... 31.76 Carat
Color ....................................................................................................................... Deep Blue
Transparency .................................................................................................. Transparent
ADDITIONAL GRADING CHARACTERISTICS
Trade Color Name ....................................................................................... London Blue
COMMENTS
Blue topaz is commonly enhanced by irradiation and/or heating to improve
its color. There is currently no scientific method available to determine
whether this gemstone has been enhanced or not.
16 January, 2026
80898017
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