1 pcs Blue Tanzanite - 19.84 ct - Antwerp Laboratory for Gemstone Testing (ALGT)
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One Tanzanite gemstone, 19.84 carats, in an oval mixed cut, vivid deep blue and transparent, commonly heated with no evidence of treatment, with ALGT laboratory report number 88408230.
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Description from the seller
09 July, 2024
ALGT Report Number 88408230
IDENTIFICATION
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.
09 July, 2024
ALGT Report Number 88408230
IDENTIFICATION
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.
Details
Nr of stones
1
Lab report number
88408230
Gemstone type
Tanzanite
Total carat weight
19.84
Gemstone colour
Blue
Transparency
Transparent
Treatment
Commonly heated with no evidence of treatment
Laboratory Report
Antwerp Laboratory for Gemstone Testing (ALGT)
Sealed by laboratory
No
Shape
Oval
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