GIA Diamonds & Diamond Grading
300+ Actual Exam Questions With Reviewed
100% Correct Detailed Answers
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1. Diamond and graphite are both made of - ANSWER carbon
2. Diamond is hard and graphite is soft because of the difference in - ANSWER
the way their atoms fit together
3. The proper environment for diamond formation includes the right
temperature, pressure, and - ANSWER the availability of carbon
4. Subduction occurs when - ANSWER two of the earth's crustal plates
collide
5. Diamonds were delivered to the earth's surface as recently as - ANSWER
20 million years ago
6. The three main components of the earth are the crust, mantle, and -
ANSWER core
,7. Before arriving at the earth's surface, diamonds might remain in the mantle
for as long as a few - ANSWER hundred million years
8. During emplacement, if diamonds are exposed to high temperature along
with decreased pressure for a long period, they will - ANSWER convert
to graphite
9. Diamond deposits found at the ocean's shore are - ANSWER marine
deposits
10.For more than 2,000 years, the only known diamond sources were -
ANSWER alluvial
11.Diamonds are more concentrated in - ANSWER marine deposits
12.Only a small percentage of known diamond deposits are mined because
most - ANSWER are not profitable
13.A mine's potential profitability depends in part on - ANSWER its ore
grade
14.Most of the diamonds mined today come from - ANSWER pipes
15.Diamonds classified as cuttable can be 100 times more valuable than -
ANSWER industrial diamonds
,16.Indicator minerals in kimberlite and lamproite might include tiny - ANSWER
diamonds
17.The first step in exploring for diamonds is to - ANSWER look for the
oldest parts of the earth's crust
18.Gravity sorting separates diamonds from - ANSWER lighter materials
19.Diamond rough suitable for use in tools, drills, and abrasives is - ANSWER
industrial quality
20.To focus their search for diamond deposits, geologists look for - ANSWER
indicator minerals
21.Diamond rough suitable for use in jewelry is called - ANSWER cuttable
22.A profitable mine - ANSWER produces diamonds whose value is higher
than the mine's operating costs
23.The concentration of diamonds within a pipe is called - ANSWER ore
grade
24.Shortly before the discovery of the South African deposits, the world's
major diamond producer was - ANSWER Brazil
, 25.Most diamonds from Australia are - ANSWER small and poor in quality
26.Russia's significant diamond deposits are in - ANSWER Siberia
27.African diamonds are recovered from - ANSWER pipe, alluvial, and
marine deposits
28.The largest percentage of world diamond production (by weight) is mined in
- ANSWER Australia
29.Chambering and block caving are methods used in - ANSWER mining
diamond pipes
30.Diamond's attraction to grease is used in - ANSWER separating diamond
from ore gravels
31.Most modern diamond-mining operations are - ANSWER large in scale
and extremely expensive
32.A horizontal tunnel drilled through a diamond pipe is called a - ANSWER
drift
33.Dirt and clay are washed from diamond-bearing ore by - ANSWER
scrubbers
300+ Actual Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!
1. Diamond and graphite are both made of - ANSWER carbon
2. Diamond is hard and graphite is soft because of the difference in - ANSWER
the way their atoms fit together
3. The proper environment for diamond formation includes the right
temperature, pressure, and - ANSWER the availability of carbon
4. Subduction occurs when - ANSWER two of the earth's crustal plates
collide
5. Diamonds were delivered to the earth's surface as recently as - ANSWER
20 million years ago
6. The three main components of the earth are the crust, mantle, and -
ANSWER core
,7. Before arriving at the earth's surface, diamonds might remain in the mantle
for as long as a few - ANSWER hundred million years
8. During emplacement, if diamonds are exposed to high temperature along
with decreased pressure for a long period, they will - ANSWER convert
to graphite
9. Diamond deposits found at the ocean's shore are - ANSWER marine
deposits
10.For more than 2,000 years, the only known diamond sources were -
ANSWER alluvial
11.Diamonds are more concentrated in - ANSWER marine deposits
12.Only a small percentage of known diamond deposits are mined because
most - ANSWER are not profitable
13.A mine's potential profitability depends in part on - ANSWER its ore
grade
14.Most of the diamonds mined today come from - ANSWER pipes
15.Diamonds classified as cuttable can be 100 times more valuable than -
ANSWER industrial diamonds
,16.Indicator minerals in kimberlite and lamproite might include tiny - ANSWER
diamonds
17.The first step in exploring for diamonds is to - ANSWER look for the
oldest parts of the earth's crust
18.Gravity sorting separates diamonds from - ANSWER lighter materials
19.Diamond rough suitable for use in tools, drills, and abrasives is - ANSWER
industrial quality
20.To focus their search for diamond deposits, geologists look for - ANSWER
indicator minerals
21.Diamond rough suitable for use in jewelry is called - ANSWER cuttable
22.A profitable mine - ANSWER produces diamonds whose value is higher
than the mine's operating costs
23.The concentration of diamonds within a pipe is called - ANSWER ore
grade
24.Shortly before the discovery of the South African deposits, the world's
major diamond producer was - ANSWER Brazil
, 25.Most diamonds from Australia are - ANSWER small and poor in quality
26.Russia's significant diamond deposits are in - ANSWER Siberia
27.African diamonds are recovered from - ANSWER pipe, alluvial, and
marine deposits
28.The largest percentage of world diamond production (by weight) is mined in
- ANSWER Australia
29.Chambering and block caving are methods used in - ANSWER mining
diamond pipes
30.Diamond's attraction to grease is used in - ANSWER separating diamond
from ore gravels
31.Most modern diamond-mining operations are - ANSWER large in scale
and extremely expensive
32.A horizontal tunnel drilled through a diamond pipe is called a - ANSWER
drift
33.Dirt and clay are washed from diamond-bearing ore by - ANSWER
scrubbers
