Violet, Blue Tanzanite - 2.02 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - Purplish Blue
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Selected by Alberto Fidalgo
Qualified goldsmith, gemmologist and diamond dealer with over fifteen years experience.
Retail Estimate € 650 - € 800
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Natural Tanzanite, 2.02 carat, octagon cut, purplish blue, origin Tanzania per ALGT report 01835717, sealed.
AI-assisted summary
Description from the seller
Natural Tanzanite - 2.02 Carat - Octagon Cut - Purplish Blue - original ALGT report and sealed.
ALGT Report Number: 01835717
Antwerp, 14 November 2025
Species: Natural Zoisite
Variety: Tanzanite
Shape: Modified Octagon, Step Cut
Dimensions: 8.65 x 6.34 x 3.59 mm
Transparent
Color: Purplish Blue
Carat weight: 2.02 carats
Additional Grading Characteristics
Suggested Origin: Tanzania
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.
Delivery: Registered shipping with insurance and tracking number.
Perfectly suited as an investment, collector's item, or for use in a jewellery setting.
Sealed and original ALGT Report No. 01835717.
Natural Tanzanite - 2.02 Carat - Octagon Cut - Purplish Blue - original ALGT report and sealed.
ALGT Report Number: 01835717
Antwerp, 14 November 2025
Species: Natural Zoisite
Variety: Tanzanite
Shape: Modified Octagon, Step Cut
Dimensions: 8.65 x 6.34 x 3.59 mm
Transparent
Color: Purplish Blue
Carat weight: 2.02 carats
Additional Grading Characteristics
Suggested Origin: Tanzania
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.
Delivery: Registered shipping with insurance and tracking number.
Perfectly suited as an investment, collector's item, or for use in a jewellery setting.
Sealed and original ALGT Report No. 01835717.
Details
Lab report number
01835717
Gemstone type
Tanzanite
Total carat weight
2.02
Gemstone colour
Blue, Violet
Transparency
Transparent
Treatment
Commonly heated with no evidence of treatment
Origin as given on certificate
Tanzania
Laboratory Report
Antwerp Laboratory for Gemstone Testing (ALGT)
Sealed by laboratory
Yes
Title additional information
Purplish Blue
Shape
Octagon
Cutting style
Step cut
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Catawiki always aims to offer you the best possible buying experience. Our experts virtually review and select every object in line with our submission guidelines. While we strive to provide a detailed description and photographs of each jewellery object, discrepancies or inaccuracies may occur. It is your responsibility to review all of the information provided about an object, including the condition and description, before placing an order. Sellers are responsible for the information, pictures and description provided, including the quality, quantity and nature of the jewelry supplied. A small imperfection that cannot be seen in the photo but is included in the description is not a non-conformity. A Lab Report is not a guarantee, valuation or appraisal regarding the articles described therein. A Lab Report contains only the characteristics of an article described after it has been graded, tested, examined, and analyzed using the techniques and equipment used at the time of the examination from that specific Lab. The results of any other examination performed on the article may differ depending when, how, by whom and with which grading standard the article is examined. In addition, any changes and improvements in techniques and equipment that may have occurred which may enable the examiner to detect, among other things, the use of processes for altering the characteristics of an article which use was previously undetectable, does not automatically mean the object does not conform to its description.
Catawiki always aims to offer you the best possible buying experience. Our experts virtually review and select every object in line with our submission guidelines. While we strive to provide a detailed description and photographs of each jewellery object, discrepancies or inaccuracies may occur. It is your responsibility to review all of the information provided about an object, including the condition and description, before placing an order. Sellers are responsible for the information, pictures and description provided, including the quality, quantity and nature of the jewelry supplied. A small imperfection that cannot be seen in the photo but is included in the description is not a non-conformity. A Lab Report is not a guarantee, valuation or appraisal regarding the articles described therein. A Lab Report contains only the characteristics of an article described after it has been graded, tested, examined, and analyzed using the techniques and equipment used at the time of the examination from that specific Lab. The results of any other examination performed on the article may differ depending when, how, by whom and with which grading standard the article is examined. In addition, any changes and improvements in techniques and equipment that may have occurred which may enable the examiner to detect, among other things, the use of processes for altering the characteristics of an article which use was previously undetectable, does not automatically mean the object does not conform to its description.
