GIA Diamonds and Diamond Grading
Final Exam #2 questions and
answers
London Diamond Syndicate✔✔What group was critical to De Beers's early sales
strategy?
Color✔✔How are gem-quality rough diamonds sorted?
Baby Boomers✔✔What generation was first to connect with diamonds as a
representation of lifetime commitment?
India✔✔Where did the diamond industry first start?
Single-channel marketing✔✔What describes the concept of centrally controlled
supply, purchase, promotion, and sales of rough diamonds?
Lower mantle✔✔What mantle layer is most dense?
Will turn into graphite✔✔What happens to diamond if lamproite stalls in the
continental crust?
When a continental and oceanic plate collide✔✔When does subduction occur?
High heat and high pressure✔✔How are metamorphic rocks formed?
CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond✔✔What is an example of
a superdeep diamond?
A good sign that a pipe is nearby✔✔What might black spinel in a mineral sample
indicate?
Robotic/automated crawlers✔✔What equipment might offshore deep-sea diamond
mining use?
Primary deposits✔✔What deposit type produces most diamonds mined today?
Character sampling✔✔What type of sampling gives an initial idea of diamond quality
for a deposit?
Brazil✔✔Where are rocks and geological structures similar to Africa found due to
ancient connections?
Crystal structure✔✔What is another term for crystal lattice?
, Type Ia✔✔What type are most natural diamonds?
Cleavage✔✔What is a smooth, flat break in a crystal parallel to a cleavage plane?
Macle✔✔What is a flat, triangular, twinned diamond crystal?
Intrinsic defect and extrinsic defects✔✔What types of point defects are found in
diamonds?
Color center✔✔What influences light absorption, resulting in bodycolor?
Hydrogen-related defects✔✔What trace element can cause a violet color in
diamonds?
Lower✔✔How does the energy emitted by a gem compare to the energy it absorbs?
White light✔✔What type of light combines all the colors in the visible spectrum?
Nitrogen defects✔✔What is the most common cause of yellow color in diamonds?
Cutting✔✔What controls light path length within a diamond?
Luster✔✔What term describes a gemstone's surface in reflected light?
Fire✔✔What describes the flashes of spectral colors seen in a polished diamond?
Determine which proportion combinations create the most attractive light
performance✔✔What was the main goal of research in developing the GIA Cut
Grading System?
Measured btwn the normal and the reflected light✔✔What best describes the angle
of incidence?
Cleaving✔✔What process splits diamond rough along its cleavage plane?
Strain✔✔What do cutters evaluate to determine when to use a scaife for coning?
Bruting✔✔What made true round-shaped diamonds possible?
Old European cut✔✔What was the prototype of the modern round brilliant cut?
Holds/secures a diamond in place✔✔What does a dop do?
High pressure, high temperature✔✔What does HPHT stand for?
Cuboctahedrons✔✔What rough form does NOT appear in natural diamonds
Final Exam #2 questions and
answers
London Diamond Syndicate✔✔What group was critical to De Beers's early sales
strategy?
Color✔✔How are gem-quality rough diamonds sorted?
Baby Boomers✔✔What generation was first to connect with diamonds as a
representation of lifetime commitment?
India✔✔Where did the diamond industry first start?
Single-channel marketing✔✔What describes the concept of centrally controlled
supply, purchase, promotion, and sales of rough diamonds?
Lower mantle✔✔What mantle layer is most dense?
Will turn into graphite✔✔What happens to diamond if lamproite stalls in the
continental crust?
When a continental and oceanic plate collide✔✔When does subduction occur?
High heat and high pressure✔✔How are metamorphic rocks formed?
CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond✔✔What is an example of
a superdeep diamond?
A good sign that a pipe is nearby✔✔What might black spinel in a mineral sample
indicate?
Robotic/automated crawlers✔✔What equipment might offshore deep-sea diamond
mining use?
Primary deposits✔✔What deposit type produces most diamonds mined today?
Character sampling✔✔What type of sampling gives an initial idea of diamond quality
for a deposit?
Brazil✔✔Where are rocks and geological structures similar to Africa found due to
ancient connections?
Crystal structure✔✔What is another term for crystal lattice?
, Type Ia✔✔What type are most natural diamonds?
Cleavage✔✔What is a smooth, flat break in a crystal parallel to a cleavage plane?
Macle✔✔What is a flat, triangular, twinned diamond crystal?
Intrinsic defect and extrinsic defects✔✔What types of point defects are found in
diamonds?
Color center✔✔What influences light absorption, resulting in bodycolor?
Hydrogen-related defects✔✔What trace element can cause a violet color in
diamonds?
Lower✔✔How does the energy emitted by a gem compare to the energy it absorbs?
White light✔✔What type of light combines all the colors in the visible spectrum?
Nitrogen defects✔✔What is the most common cause of yellow color in diamonds?
Cutting✔✔What controls light path length within a diamond?
Luster✔✔What term describes a gemstone's surface in reflected light?
Fire✔✔What describes the flashes of spectral colors seen in a polished diamond?
Determine which proportion combinations create the most attractive light
performance✔✔What was the main goal of research in developing the GIA Cut
Grading System?
Measured btwn the normal and the reflected light✔✔What best describes the angle
of incidence?
Cleaving✔✔What process splits diamond rough along its cleavage plane?
Strain✔✔What do cutters evaluate to determine when to use a scaife for coning?
Bruting✔✔What made true round-shaped diamonds possible?
Old European cut✔✔What was the prototype of the modern round brilliant cut?
Holds/secures a diamond in place✔✔What does a dop do?
High pressure, high temperature✔✔What does HPHT stand for?
Cuboctahedrons✔✔What rough form does NOT appear in natural diamonds
