GemsLabé
Gemstone Identification Report
Správa č.
082-2026
Záver
Sapphire, Corundum
Heat treatment · pôvod Sri Lanka
01Identifikácia
- Druh
- Sapphire, Corundum
- Pôvod
- Sri Lanka
- Úprava
- Heat treatment
02Merania
- Tvar a brús
- Oval
- Hmotnosť
- 0.770 ct
- Rozmery
- 6.14 × 5.09 × 3.15 mm
03Optické a fyzikálne testy
- Index lomu
- 1.760 - 1.768
- Dvojlom
- 0.009
- Polariskop
- Doubly Refractive
- Pleochroizmus
- Moderate violetish blue to light greenish blue
- Fluorescencia DV 365 nm
- inert
- Fluorescencia KV 254 nm
- inert
- Chelsea filter
- No reaction
Mikroskop
A minute crystal inclusion exhibiting a characteristic discoid halo fracture pattern — consistent with so-called 'snowball'-type inclusions — in which the surrounding partially healed discoid fractures provide evidence of exposure to high-temperature thermal enhancement.
Komentár
Thermal enhancement (heat treatment) of corundum is a widely accepted and commercially established standard practice within the international gem trade, provided it is fully and transparently disclosed to all parties throughout the chain of custody.