GIA Diamonds and Diamond Grading
Final Exam #2 Questions and Answers
London Diamond Syndicate - Answer-What group was critical to De Beers's early sales strategy?
Color - Answer-How are gem-quality rough diamonds sorted?
Baby Boomers - Answer-What generation was first to connect with diamonds as a representation of
lifetime commitment?
India - Answer-Where did the diamond industry first start?
Single-channel marketing - Answer-What describes the concept of centrally controlled supply, purchase,
promotion, and sales of rough diamonds?
Lower mantle - Answer-What mantle layer is most dense?
Will turn into graphite - Answer-What happens to diamond if lamproite stalls in the continental crust?
,When a continental and oceanic plate collide - Answer-When does subduction occur?
High heat and high pressure - Answer-How are metamorphic rocks formed?
CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond - Answer-What is an example of a superdeep
diamond?
A good sign that a pipe is nearby - Answer-What might black spinel in a mineral sample indicate?
Robotic/automated crawlers - Answer-What equipment might offshore deep-sea diamond mining use?
Primary deposits - Answer-What deposit type produces most diamonds mined today?
Character sampling - Answer-What type of sampling gives an initial idea of diamond quality for a
deposit?
Brazil - Answer-Where are rocks and geological structures similar to Africa found due to ancient
connections?
Crystal structure - Answer-What is another term for crystal lattice?
Type Ia - Answer-What type are most natural diamonds?
Cleavage - Answer-What is a smooth, flat break in a crystal parallel to a cleavage plane?
Macle - Answer-What is a flat, triangular, twinned diamond crystal?
, Intrinsic defect and extrinsic defects - Answer-What types of point defects are found in diamonds?
Color center - Answer-What influences light absorption, resulting in bodycolor?
Hydrogen-related defects - Answer-What trace element can cause a violet color in diamonds?
Lower - Answer-How does the energy emitted by a gem compare to the energy it absorbs?
White light - Answer-What type of light combines all the colors in the visible spectrum?
Nitrogen defects - Answer-What is the most common cause of yellow color in diamonds?
Cutting - Answer-What controls light path length within a diamond?
Luster - Answer-What term describes a gemstone's surface in reflected light?
Fire - Answer-What describes the flashes of spectral colors seen in a polished diamond?
Determine which proportion combinations create the most attractive light performance - Answer-What
was the main goal of research in developing the GIA Cut Grading System?
Measured btwn the normal and the reflected light - Answer-What best describes the angle of
incidence?
Cleaving - Answer-What process splits diamond rough along its cleavage plane?
Final Exam #2 Questions and Answers
London Diamond Syndicate - Answer-What group was critical to De Beers's early sales strategy?
Color - Answer-How are gem-quality rough diamonds sorted?
Baby Boomers - Answer-What generation was first to connect with diamonds as a representation of
lifetime commitment?
India - Answer-Where did the diamond industry first start?
Single-channel marketing - Answer-What describes the concept of centrally controlled supply, purchase,
promotion, and sales of rough diamonds?
Lower mantle - Answer-What mantle layer is most dense?
Will turn into graphite - Answer-What happens to diamond if lamproite stalls in the continental crust?
,When a continental and oceanic plate collide - Answer-When does subduction occur?
High heat and high pressure - Answer-How are metamorphic rocks formed?
CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond - Answer-What is an example of a superdeep
diamond?
A good sign that a pipe is nearby - Answer-What might black spinel in a mineral sample indicate?
Robotic/automated crawlers - Answer-What equipment might offshore deep-sea diamond mining use?
Primary deposits - Answer-What deposit type produces most diamonds mined today?
Character sampling - Answer-What type of sampling gives an initial idea of diamond quality for a
deposit?
Brazil - Answer-Where are rocks and geological structures similar to Africa found due to ancient
connections?
Crystal structure - Answer-What is another term for crystal lattice?
Type Ia - Answer-What type are most natural diamonds?
Cleavage - Answer-What is a smooth, flat break in a crystal parallel to a cleavage plane?
Macle - Answer-What is a flat, triangular, twinned diamond crystal?
, Intrinsic defect and extrinsic defects - Answer-What types of point defects are found in diamonds?
Color center - Answer-What influences light absorption, resulting in bodycolor?
Hydrogen-related defects - Answer-What trace element can cause a violet color in diamonds?
Lower - Answer-How does the energy emitted by a gem compare to the energy it absorbs?
White light - Answer-What type of light combines all the colors in the visible spectrum?
Nitrogen defects - Answer-What is the most common cause of yellow color in diamonds?
Cutting - Answer-What controls light path length within a diamond?
Luster - Answer-What term describes a gemstone's surface in reflected light?
Fire - Answer-What describes the flashes of spectral colors seen in a polished diamond?
Determine which proportion combinations create the most attractive light performance - Answer-What
was the main goal of research in developing the GIA Cut Grading System?
Measured btwn the normal and the reflected light - Answer-What best describes the angle of
incidence?
Cleaving - Answer-What process splits diamond rough along its cleavage plane?
