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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 400 cts 35x35x30 MM 1889E Click here to see all rough Sapphire Click here to see...
Specimen Blue Sapphire 400 cts 35x35x35 MM 1890E Click here to see all rough Sapphire Click here to see...
Specimen Blue Sapphire 300 cts 40x30x25 MM 1717E Click here to see all rough Sapphire Click here to see...
Specimen Blue Sapphire 160 cts 45x25x15 MM 006F Click here to see all rough Sapphire Click here to see...
Specimen Blue Sapphire 250 cts 50x25x15 MM 089F The stone shown is the photo is the very stone you will...
Specimen Blue Sapphire Natural 300 cts 45x40x15 MM 090F The stone shown is the photo is the very stone...
Specimen Blue Sapphire Natural 180 cts 65x25x15 MM 091F The stone shown is the photo is the very stone...
Specimen Blue Sapphire Natural 180 cts 40x25x20 MM 092F The stone shown is the photo is the very stone...