Plastic Deformation - dislocation of the crystal structure and occurs when diamond is deep within the earth. How hot it is and how much pressure. Tends to be more deep underground.
Why does this happen? Diamonds are brittle at room temperature but the atoms are mobile at extremely high temperatures. Dislocation and slipping occur along the glide plane.
Plastic is stated with dislocation is permanent. This concept is derived from geology. It distorts under pressure and does not return to its original shape after the pressure is released.
Causes brown color in many diamonds.
permanent deformation or change in shape of a solid body without fracture under the action of a sustained force. Small changes in the density of the crystals. It’s the distortion of the crystal growth and atomic structure the crystalline and pressure process.
There is elastic deformation, plastic deformation and brittle deformation.
This creates free bonds which may react to light to cause absorption. More light is absorbed toward the blue end of the spectrum, which results in brown color that is not dependent on the presence of nitrogen, or any other impurities which would cause color.
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