Yellow Sapphire
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- Good Faceted Natural Yellow Sapphire
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- Natural Yellow Sapphire
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- Low Quality Natural Yellow Sapphire
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- Yellow Sapphire Natural
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- Yellow Sapphire Rough
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- Heat Treated Natural Yellow Sapphire
| Natural Yellow Sapphire Gemstone |
| Refractive Index : 1.770 – 1.762 (+ 0.009 – 0.005) |
| Optical Characteristic : DR Uniaxial negative |
| Specific Gravity : 4.00 (+ 0.10 – 0.05) |
| Formula : AI2O3 |
| Crystal System : Trigonal |
| Variety/Species : Sapphire |
| Species/Group : Corundum |
| Birefringence : 0.008 to 0.010 |
| Dispersion : 0.018 |
| Hardness : 9 |
| Toughness : Excellent |
| Ultrasonic : Uaually safe |
| Steam : Usually safe |
| UV Long : Inert to moderate orange-red to orange yellow |
| UV Short : weak red to yellow-orange |
| Pleochroism : 2 colors |
| Strength : Weak to strong |
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| Pleochroism Colors : Medium, Yellow/pale yellow |
| Heat : Stable |
| Acids : Slightly attacked by acids |
| Light : Stable |
| Polish Luster : Vitreous to subadamantine |
| Fracture : Conchoidal to uneven |
| Fracture Luster : Vitreous |
| Clarity Type : II |
| Tones : 2-4 |
| Saturations : 1-5 |
| Cause of Color : Iron |
| Enhancements : Heating, diffusion, glass filling, irradiation |
| Cleavage : None. Frequent parting |
| Color Range : Greenish yellow, yellow, orangy yellow, yellowish |
| Transparency : Transparent to Opague |
| Phenomena : Color change, chatoyancy, schiller effect, asterism, chatoyancy (very rare) |
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| Separations : Yellow Sapphire from- Chrysoberyl : RI, optic character , SG, fluorscence (possibly). Topaz : RI, optic character, SG, f luorescence (possibly) |
| Identifying Characteristics and information Silk(fine needles crystals), 3 stes needles intersecting at 60 degree angles; fingerprint inclusions; hexagonal growth lines and color zoning. Curved striae or curved growth lines indicate synthetic corundum. |
| Spectral Data strong bands at 4710, 4600, 4500 |
| Trade Names and Misnomers Golden Sapphire Imperial Topaz (M) Indian Topaz (M) King Topaz (M) Oriental Topaz(M) |
Tags: corrundum, Corundum, fancy sapphire, Golden Sapphire, Imperial Topaz, Indian Topaz, King Topaz, Oriental Topaz, sapphire, yellow sapphire
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