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Diamond
(Carbon)
Color: Colorless, yellow, brown, red, blue,
green, black.
Moh’s hardness: 10
Refractive index: 2.417-2.419
Critical angle: 24.5°
Specific gravity: 3.47-3.55
Cleavage: Perfect
Fracture: Conchoidal, splintery
Dispersion: Strong (.044)
Heat sensitivity: None
Pleochroism: None
Birefringence (double refraction): None
Crystal structure: Isometric
Treatments: Irradiation for enhancing
colors. Fracture filling.
Cutting: Cutting can only be done with
diamond on a cast iron lap. The amount of heat generated during cutting
precludes the use of dop wax. A special mechanical device must be used to attach the
diamond to the cutting machine.
Polishing: Diamond on cast iron lap.
Comments: Rough is difficult to obtain.
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