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Corundum (aluminum oxide)
Padparadshah – Strong yellow, orange-pink to hot pink.
Ruby – Red to dark pink. Usually has a hint of violet.
Sapphire – Natural corundum is commonly thought of as dark blue, but it occurs in many other colors such as yellow, green, pink, colorless and purple.
Mohs hardness 9
Refractive index 1.766-1.774
Critical angle 34.5°
Specific gravity 3.99-4.0
Fracture Uneven, conchoidal, splintery.
Dispersion .Moderately high (018)
Heat sensitivity None
Pleochroism Dichroic. Darker colors usually show stronger dichroism. Natural blue distinct (dark blue to greenish-blue); Natural green weak (more or less yellow); Natural orange strong (orange to yellow-brown or colorless); Natural purple distinct (purple to pinkish); Natural ruby strong (deep red to yellowish-red); Natural yellow weak (yellow to light-yellow).
Birefringence (double refraction) Weak (.018)
Crystal structure Hexagonal (trigonal), dipyramidal
Cutting Corundum cuts and polishes at varying rates on different facets. Dont cut with a bonded lap at any finer grit than 600, otherwise an orange peel effect will make polishing a nightmare. Pre-polish with 8,000 grit on ceramic, zinc or copper lap helps speed up final polishing immensely.
Polishing Ceramic with 100,000 or 200,000 diamond spray, or zinc lap with 50,000 or 100,000 diamond. BATT can be used as a polish lap, but is a little soft for corundum.
Comments Orient for best color and yield. Corundum cuts and polishes differently on different facets.
Specimen Blue Sapphire Natural 60 cts 30x25x15 MM 294F The stone shown is the photo is the very stone...
Specimen Blue Sapphire 120 cts 30x28x22 MM 1724E Click here to see all rough Sapphire Click here to see...
3300 cts Red and Blue Sapphire Natural 115x85x40 MM 940F The stone shown in the photo is the very stone...
1 Pound Red and Blue Sapphire Natural 85x85x35 MM 975F The stone shown in the photo is the very stone...
2200 cts Red and Blue Sapphire Natural 98x60x35 MM 877F The stone shown in the photo is the very stone...
1100 cts Red and Blue Sapphire Natural 95x70x30 MM 879F The stone shown in the photo is the very stone...
1600 cts Red and Blue Sapphire Natural 100x65x20 MM 878F The stone shown in the photo is the very stone...