![](https://assets.catawiki.com/image/cw_lot_card/plain/assets/catawiki/assets/2024/5/15/a/a/f/aafc2330-6bd2-44aa-9aaa-6dce8e16fb45.jpg)
1 pcs 深藍-瑞士 黃玉 - 38.70 ct
編號 82562483
編號 82562483
Algt Colored Stone Identification Report # 19306951
Report Date: 16 January, 2024
============================================
Identification
Species .......................................................................................................... Natural Topaz
Variety .................................................................................................................. Blue Topaz
Description
Shape & Cutting Style ......................................................................... Oval, Mixed Cut
Measurements .................................................................... 21.02 X 13.19 X 8.84 Mm
Carat Weight ................................................................................................... 17.90 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.