No reserve price - 3 pcs Blue Topaz - 37.79 ct - Antwerp Laboratory for Gemstone Testing (ALGT) - Vivid blue
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Three natural Swiss Blue Topaz stones, total weight 37.79 ct, with individually identified ALGT reports (46404681, 51985964, 36506557) in pear, modified octagon, and oval shapes, all transparent and vivid blue; colour trade name Swiss Blue, treatment not specified in reports.
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Description from the seller
3 Natural Swiss Blue Topaz – 37.79 ct total – Individual ALGT Reports
A collection of three loose natural blue topaz gemstones in three different shapes: pear, modified octagon and oval. Each stone is individually identified in an ALGT report.
All three reports describe the stones as transparent, with Vivid Blue colour and the trade colour name Swiss Blue.
Individual specifications:
• Pear, mixed cut
Weight: 13.67 ct
Measurements: 17.36 × 13.17 × 9.20 mm
ALGT report number: 46404681
• Modified octagon, step cut
Weight: 14.18 ct
Measurements: 16.09 × 11.99 × 7.95 mm
ALGT report number: 51985964
• Oval, mixed cut
Weight: 9.94 ct
Measurements: 15.89 × 11.54 × 7.49 mm
ALGT report number: 36506557
Total weight: 37.79 ct
Number of gemstones: 3
All three ALGT reports are dated 14 October 2025 and are included in the sale.
Treatment disclosure: The reports note that blue topaz is commonly enhanced by irradiation and/or heating to improve its colour. They do not establish whether these particular stones have been enhanced. The stones are therefore not offered as verified untreated.
Geographical origin is not specified in the reports.
3 Natural Swiss Blue Topaz – 37.79 ct total – Individual ALGT Reports
A collection of three loose natural blue topaz gemstones in three different shapes: pear, modified octagon and oval. Each stone is individually identified in an ALGT report.
All three reports describe the stones as transparent, with Vivid Blue colour and the trade colour name Swiss Blue.
Individual specifications:
• Pear, mixed cut
Weight: 13.67 ct
Measurements: 17.36 × 13.17 × 9.20 mm
ALGT report number: 46404681
• Modified octagon, step cut
Weight: 14.18 ct
Measurements: 16.09 × 11.99 × 7.95 mm
ALGT report number: 51985964
• Oval, mixed cut
Weight: 9.94 ct
Measurements: 15.89 × 11.54 × 7.49 mm
ALGT report number: 36506557
Total weight: 37.79 ct
Number of gemstones: 3
All three ALGT reports are dated 14 October 2025 and are included in the sale.
Treatment disclosure: The reports note that blue topaz is commonly enhanced by irradiation and/or heating to improve its colour. They do not establish whether these particular stones have been enhanced. The stones are therefore not offered as verified untreated.
Geographical origin is not specified in the reports.
Details
Number of stones
3
Lab report number
46404681, 51985964 and 36506557
Gemstone type
Topaz
Total carat weight
37.79
Gemstone colour
Blue
Transparency
Transparent
Clarity grade
Eye clean
Treatment
Not specified in the report
Origin as given on certificate
No origin given
Laboratory report
Antwerp Laboratory for Gemstone Testing (ALGT)
Sealed by laboratory
No
Title additional information
Vivid blue
Cutting style
Mixed cut
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