GIA Diamond Grading Quiz Review
Test Questions and Answers5
What made it difficult for independent claim holders to survive during the diamond rush in
South Africa? - ANSWERS-Variable pricing
What business did Ernest Oppenheimer create to control sales of rough? - ANSWERS-Central
Selling Organisation
What global event disrupted De Beers's control of the diamond industry? - ANSWERS-Collapse
of the Soviet Union
What companies supply most of the global rough diamonds by value? - ANSWERS-ALROSA and
De Beers
Where do most diamonds form? - ANSWERS-Upper mantle
What element limits potential diamond formation with available carbon in mantle keels? -
ANSWERS-Oxygen
What indicates superdeep diamond formation? - ANSWERS-Inclusions
Where do diamond-bearing kimberlites tend to occur? - ANSWERS-Center of cratons
Where do lamproites tend to occur? - ANSWERS-Edge of cratons
, How many carats must bulk sampling produce for accurate evaluation of a primary deposit? -
ANSWERS-2000
What is one of the world's top diamond-producing countries by value and volume? - ANSWERS-
Botswana
What type of diamond mining is typically done in Brazil? - ANSWERS-Small-scale
How many tetrahedrons form the core of a diamond's unit cell? - ANSWERS-4
What is distortion or deformation in a crystal? - ANSWERS-Strain
Which crystal system is the most symmetrical? - ANSWERS-Cubic
Which type of growth mark indicates a cubic crystal face in diamond? - ANSWERS-Tetragons
Where do plates exist? - ANSWERS-Lithosphere
What process is critical in diamond formation? - ANSWERS-Subduction
What is a carbon source for diamond formation in mantle keels? - ANSWERS-Eclogite
What testing is first performed after locating a diamond deposit? - ANSWERS-Microdiamond
testing
What is an example of an extrinsic defect? - ANSWERS-Trace element
Test Questions and Answers5
What made it difficult for independent claim holders to survive during the diamond rush in
South Africa? - ANSWERS-Variable pricing
What business did Ernest Oppenheimer create to control sales of rough? - ANSWERS-Central
Selling Organisation
What global event disrupted De Beers's control of the diamond industry? - ANSWERS-Collapse
of the Soviet Union
What companies supply most of the global rough diamonds by value? - ANSWERS-ALROSA and
De Beers
Where do most diamonds form? - ANSWERS-Upper mantle
What element limits potential diamond formation with available carbon in mantle keels? -
ANSWERS-Oxygen
What indicates superdeep diamond formation? - ANSWERS-Inclusions
Where do diamond-bearing kimberlites tend to occur? - ANSWERS-Center of cratons
Where do lamproites tend to occur? - ANSWERS-Edge of cratons
, How many carats must bulk sampling produce for accurate evaluation of a primary deposit? -
ANSWERS-2000
What is one of the world's top diamond-producing countries by value and volume? - ANSWERS-
Botswana
What type of diamond mining is typically done in Brazil? - ANSWERS-Small-scale
How many tetrahedrons form the core of a diamond's unit cell? - ANSWERS-4
What is distortion or deformation in a crystal? - ANSWERS-Strain
Which crystal system is the most symmetrical? - ANSWERS-Cubic
Which type of growth mark indicates a cubic crystal face in diamond? - ANSWERS-Tetragons
Where do plates exist? - ANSWERS-Lithosphere
What process is critical in diamond formation? - ANSWERS-Subduction
What is a carbon source for diamond formation in mantle keels? - ANSWERS-Eclogite
What testing is first performed after locating a diamond deposit? - ANSWERS-Microdiamond
testing
What is an example of an extrinsic defect? - ANSWERS-Trace element
