No Reserve Price - 1 pcs Purple, Violet Amethyst - 15.78 ct - International Gemological Institute (IGI)

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Ghene Menezes
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Retail Estimate  € 380 - € 480
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Amethyst gemstone, 1 stone, total weight 15.78 ct, octagonal mixed cut, violet color, eye-clean clarity, commonly heated with no evidence of treatment, IGI report no. 746504183.

AI-assisted summary

Description from the seller

Report Number: 746504183
• Date: November 7, 2025
• Species: Quartz
• Variety: Amethyst
• Shape & Cut: Octagonal Mixed Cut
• Carat Weight: 15.78 ct
• Measurements: 17.24 × 16.88 × 11.84 mm
• Color & Transparency: Violet, Transparent
• Characteristics: Natural inclusions pattern
• Comments: Amethysts are occasionally heated during fashioning to enhance color
• Optical & Physical Properties:
• Refractive Index: 1.544 – 1.553
• Birefringence: 0.009
• Optic Character: Uniaxial (+)
• Specific Gravity: 2.66

Report Number: 746504183
• Date: November 7, 2025
• Species: Quartz
• Variety: Amethyst
• Shape & Cut: Octagonal Mixed Cut
• Carat Weight: 15.78 ct
• Measurements: 17.24 × 16.88 × 11.84 mm
• Color & Transparency: Violet, Transparent
• Characteristics: Natural inclusions pattern
• Comments: Amethysts are occasionally heated during fashioning to enhance color
• Optical & Physical Properties:
• Refractive Index: 1.544 – 1.553
• Birefringence: 0.009
• Optic Character: Uniaxial (+)
• Specific Gravity: 2.66

Details

Nr of stones
1
Lab report number
746504183
Gemstone type
Amethyst
Total carat weight
15.78
Gemstone colour
Purple, Violet
Cut grade
Very good
Transparency
Transparent
Clarity grade
Eye clean
Treatment
Commonly heated with no evidence of treatment
Origin as given on certificate
No origin given
Laboratory Report
International Gemological Institute (IGI)
Sealed by laboratory
No
Shape
Octagon
Cutting style
Mixed cut
Sold by
ThailandVerified
36
Objects sold
100%
pro

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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.

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