GIA DIAMONDS AND DIAMOND GRADING
EXAM Questions and Answers Latest
Version 2025 GRADED A+
Gravity sorting involves separating the lighter materials out of the test
samples until only the diamonds are left
A profitable mine: Right Ans - Produces diamonds, whose value is higher
than the mines operating costs
It's expensive to establish and operate a diamond mind, so mining companies
spend a lot of time and money to analyze the deposit for its potential
profitability
The first step, and exploring, for diamonds is to: Right Ans - Look for the
oldest parts of the earths crust
Scientist search for cratons - the oldest thickest most stable parts of the earths
crust, because they are the most likely locations for diamonds deposits
Only a small percentage of known Diamond deposits are mined because most:
Right Ans - Are not profitable
It's common for mining companies to leave diamonds in the ground at the
deposits, don't contain enough diamonds to make them profitable to mine
Indicator Minerals and Kimberlite and Lamproite include tiny: Right Ans -
Diamonds
Indicator Minerals in Kimberlite and lamproite include red and orange,
garnet, black, spinel, and sometimes tiny diamonds
Most modern diamond mining operations are: Right Ans - Large and scale
and extremely expensive
,Most modern diamond minds consist of giant excavations and require the use
of massive equipment
The shift and emphasis from alluvial to primary diamond mining was due to:
Right Ans - Improved technology
The shifting emphasis from alluvium to primary mining is due primarily to the
improved technologies, used to locate and develop diamond bearing pipes
Russia's significant diamond deposits are in: Right Ans - Siberia
Russia production comes mostly from the Siberian republic of Sakha, and is
almost totally from primary sources
African diamonds are recovered from: Right Ans - Pipe, alluvial, and
marine deposits
Although the earliest African Diamond finds were alluvial, current production
is almost 90% from Kimberlite pipes it's marine deposits are also abundant
and hold great promise for the future
Chambering and block caving are methods used in: Right Ans - Mining
diamond pipes
When an open pit operation is no longer economical, but worthwhile
diamonds remain in the pipe, the mine goes underground. Chambering and
block, caving our methods that use a system of vertical shafts, horizontal,
tunnels into the pipe, and blasting to loosen ore for removal.
Removal of mineral, bearing ore from a surface excavation is called: Right
Ans - Open pit mining
In most open pit, Mine, removal of overburden, and ore results in an ever
deepening pit with terrace sides that provide a roadway for rock bearing
trucks
The largest percentage of world diamond production by weight is mined in:
Right Ans - Australia
, Most of Australia's diamonds are small, but no other source has equal the
volume of diamonds it produces
Russia's Diamond sources are almost all: Right Ans - Primary
Russia's diamond production is almost entirely from primary sources, which
the government owns an operates as conventional open pit mines
Dirt and Clay are washed from Diamond bearing ore by: Right Ans -
Scrubbers
After it's been crushed, Diamond, bearing, ore goes to a machine called
scrubber, which removes dirt and particles of clay, from the ore
Dense media separation is based on the fact that: Right Ans - Diamond sink
to the bottom of a mix of gravels
Diamond bearing gravel sink to the bottom of the dense media separator
while lighter waste material spin out of the top
A horizontal tunnel drill through a diamond pipe is called a: Right Ans -
Drift
Horizontal, tunnels, called drifts, are drilled into the diamond pipe to extract
the ore
Diamonds attraction to grease is used in: Right Ans - Separating Diamond
from ore gravels
Diamond bearing gravels are washed over a grease belt the diamonds stick to
the belt, and the other materials are washed away
Shortly before the discovery of the South African deposits, the worlds major
diamond Producer was: Right Ans - Brazil
Brazil replaced India as the worlds main source of diamonds in the 1700s
Most diamonds from Australia are: Right Ans - Small and poor in quality
EXAM Questions and Answers Latest
Version 2025 GRADED A+
Gravity sorting involves separating the lighter materials out of the test
samples until only the diamonds are left
A profitable mine: Right Ans - Produces diamonds, whose value is higher
than the mines operating costs
It's expensive to establish and operate a diamond mind, so mining companies
spend a lot of time and money to analyze the deposit for its potential
profitability
The first step, and exploring, for diamonds is to: Right Ans - Look for the
oldest parts of the earths crust
Scientist search for cratons - the oldest thickest most stable parts of the earths
crust, because they are the most likely locations for diamonds deposits
Only a small percentage of known Diamond deposits are mined because most:
Right Ans - Are not profitable
It's common for mining companies to leave diamonds in the ground at the
deposits, don't contain enough diamonds to make them profitable to mine
Indicator Minerals and Kimberlite and Lamproite include tiny: Right Ans -
Diamonds
Indicator Minerals in Kimberlite and lamproite include red and orange,
garnet, black, spinel, and sometimes tiny diamonds
Most modern diamond mining operations are: Right Ans - Large and scale
and extremely expensive
,Most modern diamond minds consist of giant excavations and require the use
of massive equipment
The shift and emphasis from alluvial to primary diamond mining was due to:
Right Ans - Improved technology
The shifting emphasis from alluvium to primary mining is due primarily to the
improved technologies, used to locate and develop diamond bearing pipes
Russia's significant diamond deposits are in: Right Ans - Siberia
Russia production comes mostly from the Siberian republic of Sakha, and is
almost totally from primary sources
African diamonds are recovered from: Right Ans - Pipe, alluvial, and
marine deposits
Although the earliest African Diamond finds were alluvial, current production
is almost 90% from Kimberlite pipes it's marine deposits are also abundant
and hold great promise for the future
Chambering and block caving are methods used in: Right Ans - Mining
diamond pipes
When an open pit operation is no longer economical, but worthwhile
diamonds remain in the pipe, the mine goes underground. Chambering and
block, caving our methods that use a system of vertical shafts, horizontal,
tunnels into the pipe, and blasting to loosen ore for removal.
Removal of mineral, bearing ore from a surface excavation is called: Right
Ans - Open pit mining
In most open pit, Mine, removal of overburden, and ore results in an ever
deepening pit with terrace sides that provide a roadway for rock bearing
trucks
The largest percentage of world diamond production by weight is mined in:
Right Ans - Australia
, Most of Australia's diamonds are small, but no other source has equal the
volume of diamonds it produces
Russia's Diamond sources are almost all: Right Ans - Primary
Russia's diamond production is almost entirely from primary sources, which
the government owns an operates as conventional open pit mines
Dirt and Clay are washed from Diamond bearing ore by: Right Ans -
Scrubbers
After it's been crushed, Diamond, bearing, ore goes to a machine called
scrubber, which removes dirt and particles of clay, from the ore
Dense media separation is based on the fact that: Right Ans - Diamond sink
to the bottom of a mix of gravels
Diamond bearing gravel sink to the bottom of the dense media separator
while lighter waste material spin out of the top
A horizontal tunnel drill through a diamond pipe is called a: Right Ans -
Drift
Horizontal, tunnels, called drifts, are drilled into the diamond pipe to extract
the ore
Diamonds attraction to grease is used in: Right Ans - Separating Diamond
from ore gravels
Diamond bearing gravels are washed over a grease belt the diamonds stick to
the belt, and the other materials are washed away
Shortly before the discovery of the South African deposits, the worlds major
diamond Producer was: Right Ans - Brazil
Brazil replaced India as the worlds main source of diamonds in the 1700s
Most diamonds from Australia are: Right Ans - Small and poor in quality
