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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.
Gray Sapphire 240 cts 35x25x25 MM 728F The Stone in the photo is the stone you will receive. Tommysrocks...
Gray Sapphire 300 cts 30x30x25 MM 729F The Stone in the photo is the stone you will receive. Tommysrocks...
Gray Sapphire 270 cts 30 MM 730F The Stones in the photo are the stones you will receive. Tommysrocks...
Gray Sapphire 400 cts 40x35x28 MM 1780F The Stone in the photo is the stone you will receive. Tommysrocks...
Gray Sapphire 300 cts 38x38x28 MM 1781F The Stone in the photo is the stone you will receive. Tommysrocks...
Gray Sapphire 240 cts 40x35x28 MM 1782F The Stone in the photo is the stone you will receive. Tommysrocks...
Gray Sapphire 200 cts 40x25x20 MM 1783F The Stone in the photo is the stone you will receive. Tommysrocks...
Gray Sapphire 370 cts 20 to 35 MM 1784F The Stones in the photo are the stones you will receive. 7.40...
Gray Sapphire 420 cts 20 to 30 MM 1785F The Stones in the photo are the stones you will receive. 8.40...