What do the interference colors reflect/represent?

What do the interference colors reflect/represent?

• A. The color of the diamond's surface.
• B. The growth temperature.
• C. The intensity of the strain.
• D. The level of nitrogen impurities.

Answer: (C)

Interference colors come from birefringence caused by internal strain in the diamond. When polarized light passes through a crystal with lattice distortions, the crystal behaves like a tiny wave retarder, splitting the light into two rays that travel at different speeds. As these rays recombine, they interfere and produce colors whose brightness and hue depend on the amount of retardation. The more strain there is, the stronger and more vivid the interference colors appear. This visual cue specifically indicates the level of internal strain, not surface color, growth temperature, or nitrogen impurities.

Interference colors come from birefringence caused by internal strain in the diamond. When polarized light passes through a crystal with lattice distortions, the crystal behaves like a tiny wave retarder, splitting the light into two rays that travel at different speeds. As these rays recombine, they interfere and produce colors whose brightness and hue depend on the amount of retardation. The more strain there is, the stronger and more vivid the interference colors appear. This visual cue specifically indicates the level of internal strain, not surface color, growth temperature, or nitrogen impurities.