Diamonds & diamond grading final exam
1. Bourse: A diamond buying and selling club
- they have them in trading centers
2. Peridotite: 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
3. Eglogite: A type of rock that diamond form in
- metamorphic rock (rocks that have been altered by heat and pressure
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, Diamonds & diamond grading final exam
- does not have a consistent release of carbon
4. How far beneath the earth do diamonds form?: 90-140 miles (140-220
kilome- ters)
5. Drift: A horizontal tunnel drilled through a diamond pipe
6. De Beers Consolidated Mines Ltd. was named after: the owners of a
farm where one of the first diamond rushes took place.
7. The Central Selling Organization (CSO): A rough diamond distribution
agency
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, Diamonds & diamond grading final exam
- served as this until 2001
8. Pipes: The deep vertical formations through which diamonds travel to
the surface
9. Chambering: An older underground mining technique
- expensive & dangerous so no longer used
- block caving is the alternative to this
10.Most of the diamonds that come from Africa are recovered from:
pipe, alluvial, and marine deposits
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, Diamonds & diamond grading final exam
11.Most of the diamonds that come from Russia are recovered from:
Primary Sources
12.What is the specific gravity of a gem-quality diamond?: 3.52
13.Diamonds are more concentrated in which type of deposit?: Marine
de- posits
14.The first step in exploring for diamonds is to: look for the oldest parts
of the earth's crust
15. The diamond industry has changed dramatically in recent years because
4/
1. Bourse: A diamond buying and selling club
- they have them in trading centers
2. Peridotite: 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
3. Eglogite: A type of rock that diamond form in
- metamorphic rock (rocks that have been altered by heat and pressure
1/
, Diamonds & diamond grading final exam
- does not have a consistent release of carbon
4. How far beneath the earth do diamonds form?: 90-140 miles (140-220
kilome- ters)
5. Drift: A horizontal tunnel drilled through a diamond pipe
6. De Beers Consolidated Mines Ltd. was named after: the owners of a
farm where one of the first diamond rushes took place.
7. The Central Selling Organization (CSO): A rough diamond distribution
agency
2/
, Diamonds & diamond grading final exam
- served as this until 2001
8. Pipes: The deep vertical formations through which diamonds travel to
the surface
9. Chambering: An older underground mining technique
- expensive & dangerous so no longer used
- block caving is the alternative to this
10.Most of the diamonds that come from Africa are recovered from:
pipe, alluvial, and marine deposits
3/
, Diamonds & diamond grading final exam
11.Most of the diamonds that come from Russia are recovered from:
Primary Sources
12.What is the specific gravity of a gem-quality diamond?: 3.52
13.Diamonds are more concentrated in which type of deposit?: Marine
de- posits
14.The first step in exploring for diamonds is to: look for the oldest parts
of the earth's crust
15. The diamond industry has changed dramatically in recent years because
4/
