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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 200 cts 35x35x15 MM 187F The stone shown is the photo is the very stone...
Specimen Blue Sapphire Natural 140 cts 35x25x20 MM 188F The stone shown is the photo is the very stone...
Specimen Blue Sapphire Natural 130 cts 25x25x20 MM 189F The stone shown is the photo is the very stone...
Specimen Blue Sapphire Natural 80 cts 35x30x15 MM 190F The stone shown is the photo is the very stone...
Specimen Blue Sapphire Natural 160 cts 35 MM 192F The stones shown is the photo are the very stone you...
Specimen Blue Sapphire Natural 170 cts 25 to 45 MM 193F The stones shown is the photo are the very stone...
Specimen Blue Sapphire Natural 170 cts 40 MM 194F The stones shown is the photo are the very stone you...
Specimen Blue Sapphire Natural 110 cts 35x25x15 MM 292F The stone shown is the photo is the very stone...
Specimen Blue Sapphire Natural 150 cts 15 to 30 MM 198F The stones shown is the photo are the very stone...