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Diamonds & diamond grading final exam Guide
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Diamonds & diamond grading final exam Guide
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Diamonds & diamond grading final examGuide
Bourse - Correct Answer ✅ A diamond buying and selling
club
- they have them in trading centers
Peridotite - Correct Answer ✅ A type of rock that diamonds
form in
- igneous rock ( formed from a molten state)
- most diamond form in this rock
- has consistent release of carbon
Eglogite - Correct Answer ✅ A type of rock that diamond
form in
- metamorphic rock (rocks that have been altered by heat
and pressure
- does not have a consistent release of carbon
How far beneath the earth do diamonds form? - Correct
Answer ✅ 90-140 miles (140-220 kilometers)
,Diamonds & diamond grading final exam
Guide
Drift - Correct Answer ✅ A horizontal tunnel drilled through
a diamond pipe
De Beers Consolidated Mines Ltd. was named after - Correct
Answer ✅ the owners of a farm where one of the first
diamond rushes took place.
The Central Selling Organization (CSO) - Correct Answer ✅
A rough diamond distribution agency
- served as this until 2001
Pipes - Correct Answer ✅ The deep vertical formations
through which diamonds travel to the surface
Chambering - Correct Answer ✅ An older underground
mining technique
- expensive & dangerous so no longer used
- block caving is the alternative to this
, Diamonds & diamond grading final exam
Guide
Most of the diamonds that come from Africa are recovered
from - Correct Answer ✅ pipe, alluvial, and marine deposits
Most of the diamonds that come from Russia are recovered
from - Correct Answer ✅ Primary Sources
What is the specific gravity of a gem-quality diamond? -
Correct Answer ✅ 3.52
Diamonds are more concentrated in which type of deposit? -
Correct Answer ✅ Marine deposits
The first step in exploring for diamonds is to - Correct
Answer ✅ look for the oldest parts of the earth's crust
The diamond industry has changed dramatically in recent
years because - Correct Answer ✅ the world's supply of
diamond rough has increased
- this means diamonds are available to more people
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