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GIA Diamonds and Diamond Grading Assignment 7 Questionnaire with Answers

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What is the refractive index of a material with a small critical angle? A. Low B. Zero C. High D. Irrelevant - Answer-C. High What describes the separation of white light into its spectral colors? A. Brightness B. Brilliance C. Dispersion D. Scintillation - Answer-C. Dispersion What pattern can result from a deep pavilion? A. Fisheye B. Nailhead C. Radiating mains D. Hearts and arrows - Answer-B. Nailhead What describes the change in speed and/or direction when light travels from air into diamond? A. Surface reflection B. Refraction C. Internal reflection D. Critical angle - Answer-B. Refraction What is always equal to the angle of reflection? A. Normal B. Critical angle C. Wavelength D. Angle of incidence - Answer-D. Angle of incidence What characteristic helps provide a visual assessment for cut grade? A. Absorption B. Pattern C. Carat weight D. Refractive index - Answer-B. Pattern How is polish assessed in cut grading? A. Facet placement

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GIA Diamonds and Diamond Grading
Assignment 7 Questionnaire with
Answers
What is the refractive index of a material with a small critical angle?
A. Low
B. Zero
C. High
D. Irrelevant - Answer-C. High

What describes the separation of white light into its spectral colors?
A. Brightness
B. Brilliance
C. Dispersion
D. Scintillation - Answer-C. Dispersion

What pattern can result from a deep pavilion?
A. Fisheye
B. Nailhead
C. Radiating mains
D. Hearts and arrows - Answer-B. Nailhead

What describes the change in speed and/or direction when light travels from air into
diamond?
A. Surface reflection
B. Refraction
C. Internal reflection
D. Critical angle - Answer-B. Refraction

What is always equal to the angle of reflection?
A. Normal
B. Critical angle
C. Wavelength
D. Angle of incidence - Answer-D. Angle of incidence

What characteristic helps provide a visual assessment for cut grade?
A. Absorption
B. Pattern
C. Carat weight
D. Refractive index - Answer-B. Pattern

How is polish assessed in cut grading?
A. Facet placement

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