No Reserve Price - 1 pcs Blue Topaz - 24.00 ct - International Gemological Institute (IGI)

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Current bid
€ 30
No reserve price
Ghene Menezes
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Retail Estimate  € 350 - € 430
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A 24.00 ct blue topaz in a cut cornered rectangular emerald shape, IGI certified with natural inclusions and irradiation with heat treatment.

AI-assisted summary

Description from the seller

IGI Report Number: 746504147
• Species/Variety: Natural Topaz / Blue Topaz
• Shape & Cut: Cut Cornered Rectangular Mixed Cut
• Weight: 24.00 ct
• Measurements: 18.36 × 13.57 × 10.62 mm
• Color & Transparency: Blue, Transparent
• Characteristics: Natural inclusions
• Comments: Blue Topaz is commonly treated by irradiation followed by heat. Indicative evidence of treatment is typically lacking.
• Optical & Physical Properties:
• Refractive Index: 1.619 – 1.627
• Birefringence: 0.008
• Optic Character: Biaxial
• Specific Gravity: 3.53

IGI Report Number: 746504147
• Species/Variety: Natural Topaz / Blue Topaz
• Shape & Cut: Cut Cornered Rectangular Mixed Cut
• Weight: 24.00 ct
• Measurements: 18.36 × 13.57 × 10.62 mm
• Color & Transparency: Blue, Transparent
• Characteristics: Natural inclusions
• Comments: Blue Topaz is commonly treated by irradiation followed by heat. Indicative evidence of treatment is typically lacking.
• Optical & Physical Properties:
• Refractive Index: 1.619 – 1.627
• Birefringence: 0.008
• Optic Character: Biaxial
• Specific Gravity: 3.53

Details

Nr of stones
1
Lab report number
746504142
Gemstone type
Topaz
Total carat weight
24.00
Gemstone colour
Blue
Transparency
Transparent
Clarity grade
Slight
Treatment
Commonly irradiated with no evidence of treatment, Heat treatment
Origin as given on certificate
No origin given
Laboratory Report
International Gemological Institute (IGI)
Sealed by laboratory
No
Shape
Emerald
Cutting style
Mixed cut
Sold by
ThailandVerified
31
Objects sold
pro

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