GIA DIAMONDS AND DIAMOND GRADING FINAL
EXAM NEWEST ACTUAL EXAM COMPLETE 186
QUESTIONS AND DETAILED ANSWERS| ALREADY
GRADED A+
What group was critical to De Beers's early sales strategy? -CORRECT ANSWER
London Diamond Syndicate
How are gem-quality rough diamonds sorted? -CORRECT ANSWER Color
What generation was first to connect with diamonds as a representation of lifetime
commitment? -CORRECT ANSWER Baby Boomers
Where did the diamond industry first start? -CORRECT ANSWER India
What describes the concept of centrally controlled supply, purchase, promotion, and
sales of rough diamonds? -CORRECT ANSWER Single-channel marketing
What mantle layer is most dense? -CORRECT ANSWER Lower mantle
What happens to diamond if lamproite stalls in the continental crust? -CORRECT
ANSWER Will turn into graphite
When does subduction occur? -CORRECT ANSWER When a continental and oceanic
plate collide
How are metamorphic rocks formed? -CORRECT ANSWER High heat and high pressure
What is an example of a superdeep diamond? -CORRECT ANSWER CLIPPIR
diamonds, blue diamonds, Brazil's Junia diamond
What might black spinel in a mineral sample indicate? -CORRECT ANSWER A good sign
that a pipe is nearby
What equipment might offshore deep-sea diamond mining use? -CORRECT ANSWER
Robotic/automated crawlers
What deposit type produces most diamonds mined today? -CORRECT ANSWER
Primary deposits
, What type of sampling gives an initial idea of diamond quality for a deposit? -CORRECT
ANSWER Character sampling
Where are rocks and geological structures similar to Africa found due to ancient
connections? -CORRECT ANSWER Brazil
What is another term for crystal lattice? -CORRECT ANSWER Crystal structure
What type are most natural diamonds? -CORRECT ANSWER Type Ia
What is a smooth, flat break in a crystal parallel to a cleavage plane? -CORRECT
ANSWER Cleavage
What is a flat, triangular, twinned diamond crystal? -CORRECT ANSWER Macle
What types of point defects are found in diamonds? -CORRECT ANSWER Intrinsic
defect and extrinsic defects
What influences light absorption, resulting in bodycolor? -CORRECT ANSWER Color
center
What trace element can cause a violet color in diamonds? -CORRECT ANSWER
Hydrogen-related defects
How does the energy emitted by a gem compare to the energy it absorbs? -CORRECT
ANSWER Lower
What type of light combines all the colors in the visible spectrum? -CORRECT ANSWER
White light
What is the most common cause of yellow color in diamonds? -CORRECT ANSWER
Nitrogen defects
What controls light path length within a diamond? -CORRECT ANSWER Cutting
What term describes a gemstone's surface in reflected light? -CORRECT ANSWER
Luster
What describes the flashes of spectral colors seen in a polished diamond? -CORRECT
ANSWER Fire
EXAM NEWEST ACTUAL EXAM COMPLETE 186
QUESTIONS AND DETAILED ANSWERS| ALREADY
GRADED A+
What group was critical to De Beers's early sales strategy? -CORRECT ANSWER
London Diamond Syndicate
How are gem-quality rough diamonds sorted? -CORRECT ANSWER Color
What generation was first to connect with diamonds as a representation of lifetime
commitment? -CORRECT ANSWER Baby Boomers
Where did the diamond industry first start? -CORRECT ANSWER India
What describes the concept of centrally controlled supply, purchase, promotion, and
sales of rough diamonds? -CORRECT ANSWER Single-channel marketing
What mantle layer is most dense? -CORRECT ANSWER Lower mantle
What happens to diamond if lamproite stalls in the continental crust? -CORRECT
ANSWER Will turn into graphite
When does subduction occur? -CORRECT ANSWER When a continental and oceanic
plate collide
How are metamorphic rocks formed? -CORRECT ANSWER High heat and high pressure
What is an example of a superdeep diamond? -CORRECT ANSWER CLIPPIR
diamonds, blue diamonds, Brazil's Junia diamond
What might black spinel in a mineral sample indicate? -CORRECT ANSWER A good sign
that a pipe is nearby
What equipment might offshore deep-sea diamond mining use? -CORRECT ANSWER
Robotic/automated crawlers
What deposit type produces most diamonds mined today? -CORRECT ANSWER
Primary deposits
, What type of sampling gives an initial idea of diamond quality for a deposit? -CORRECT
ANSWER Character sampling
Where are rocks and geological structures similar to Africa found due to ancient
connections? -CORRECT ANSWER Brazil
What is another term for crystal lattice? -CORRECT ANSWER Crystal structure
What type are most natural diamonds? -CORRECT ANSWER Type Ia
What is a smooth, flat break in a crystal parallel to a cleavage plane? -CORRECT
ANSWER Cleavage
What is a flat, triangular, twinned diamond crystal? -CORRECT ANSWER Macle
What types of point defects are found in diamonds? -CORRECT ANSWER Intrinsic
defect and extrinsic defects
What influences light absorption, resulting in bodycolor? -CORRECT ANSWER Color
center
What trace element can cause a violet color in diamonds? -CORRECT ANSWER
Hydrogen-related defects
How does the energy emitted by a gem compare to the energy it absorbs? -CORRECT
ANSWER Lower
What type of light combines all the colors in the visible spectrum? -CORRECT ANSWER
White light
What is the most common cause of yellow color in diamonds? -CORRECT ANSWER
Nitrogen defects
What controls light path length within a diamond? -CORRECT ANSWER Cutting
What term describes a gemstone's surface in reflected light? -CORRECT ANSWER
Luster
What describes the flashes of spectral colors seen in a polished diamond? -CORRECT
ANSWER Fire
