編號 102816158

1 pcs 藍色 尖晶石 - 3.01 ct - Gem research Swiss Lab (GRS) - 罕见钴尖晶石 -GRS
編號 102816158

1 pcs 藍色 尖晶石 - 3.01 ct - Gem research Swiss Lab (GRS) - 罕见钴尖晶石 -GRS
Dimensions:
8.01 × 9.03 × 5.64 mm
Weight:
3.01 carats
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Colour
Exceptional vivid cobalt-blue with strong saturation and medium to medium-deep tone.
This stone displays the highly desirable electric cobalt character — a vibrant, intense blue rarely seen in spinel. Under neutral daylight, it shows a rich royal-to-electric blue, while under cooler lighting it exhibits remarkable brilliance and lively internal reflections.
Unlike ordinary blue spinel, this gem owes its colour to cobalt — significantly rarer and more sought after by collectors.
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Clarity
Transparent. Eye-clean at normal viewing distance.
Under 10× magnification, minor natural inclusions typical of natural cobalt spinel are present. These inclusions confirm natural origin and do not affect overall brilliance or durability.
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Cut & Presence
Heart cut — a rare and challenging shape to execute properly.
The stone presents an attractive, symmetrical outline with excellent face-up presence.
At over 3 carats, this is a substantial size for cobalt spinel, especially in a heart shape — a combination rarely encountered on the market.
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Lustre
Strong vitreous lustre with lively brilliance and good light return.
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Condition
Excellent overall condition.
No visible chips, scratches, or abrasions.
No durability concerns.
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Treatments
No indication of thermal treatment (PL tested), as stated in the GRS report.
No evidence of any other treatment.
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Certification
GRS GemResearch Swisslab
Report No. GRS2025-051462
Origin: Tanzania
Identification: Natural Cobalt Spinel
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