1 pcs [伦敦]（深蓝）[色彩细腻] 黄宝石 - 18.63 ct

Algt Colored Stone Identification Report # 52091294
Report Date: 16 January, 2024
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Identification

Species .......................................................................................................... Natural Topaz
Variety .................................................................................................................. Blue Topaz

Description

Shape & Cutting Style ......................................................................... Oval, Mixed Cut
Measurements .................................................................... 19.66 X 14.87 X 8.98 Mm
Carat Weight ................................................................................................... 18.63 Carat
Color ....................................................................................................................... Deep Blue
Transparency .................................................................................................. Transparent

Additional Grading Characteristics

Trade Color Name ....................................................................................... London Blue
Color Quality Grade .......................................................................... Fine Color Quality

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.