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GIA Diamonds and Diamond Grading: Assignment 3 Questionnaire
- Exam (elaborations) • 3 pages • 2024
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How are igneous rocks formed? 
A. In gas 
B. By erosion 
C. From a molten state 
D. By heat and pressure - C. From a molten state 
How can crustal diamonds form? 
A. Oceanic subduction 
B. Volcanic eruptions 
C. Meteorite impacts 
D. Radiation decay - C. Meteorite impacts 
How does metasomatism affect lithospheric diamond formation? 
A. Supplies heat 
B. Transports rock 
C. Removes oxygen 
D. Provides hydrogen - C. Removes oxygen 
What are the rock types where most diamonds form? 
A. Basaltic cr...
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GIA Diamond Essentials Exam Guide Questions And Answers 2024
- Exam (elaborations) • 8 pages • 2024
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chemical element - consists of only one kind of atom 
 
mineral - inorganic. most minerals are a combo of 2 or more elements 
 
diamonds form - within 90-120 miles below earth's surface 
 
value factos - features used to judge the quality and value of stones - a diamonds value is based on its combo of the Four C's 
 
inclusions - clarity characteristic totally enclosed in a polished gemstone or extending into it from the surface. affect value most 
 
blemishes - clarity characteristic on the s...
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