沒有保留價 - 1 pcs 藍色 坦桑石 - 19.84 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

09 July, 2024
ALGT Report Number 88408230

Species ................................................................................ Natural Zoisite
Variety ............................................................................................ Tanzanite
DESCRIPTION
Shape & Cutting Style ............................................... Oval, Mixed Cut
Measurements ............................................ 17.67 x 13.80 x 9.93 mm
Carat Weight ........................................................................... 19.84 Carat
Color .............................................................. Vivid/Deep Blue (Purplish)
Transparency ......................................................................... Transparent
ADDITIONAL GRADING CHARACTERISTICS
Color Quality Grade ................................................. Fine Color Quality
Suggested Origin ....................................................................... Tanzania
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 oil in fissures.
Oiling has become common practice in trade for many
gemstones. This enhancement is reversible at any time.