Diamonds and Diamond Grading GIA
Actual Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!
1. What results from kimberlite or lamproite eruptions? - ANSWER Pipes:
What remains is a diamond-bearing pipe: a deep vertical formation that
results from a kimberlite or lamproite eruption.
2. Where do most mined diamonds form? - ANSWER Lithosphere: The
majority of diamonds mined are thought to form based on two models:
lithospheric and superdeep. Lithospheric diamonds form under cratons in
mantle keels.
3. What is an example of a superdeep diamond? - ANSWER CLIPPIR:
CLIPPIR diamonds, blue diamonds, and Brazil's Juína diamonds are three
well-studied examples of superdeep diamonds.
4. What lies beneath cratons? - ANSWER Mantle keels: The downward-
protruding shape of the lithosphere beneath a craton looks like a boat's
keel. Deepest at the center, these portions of the mantle are called mantle
keels. These depths provide the right temperatures and pressures for
diamonds to form and reside. Scientists believe the majority of diamonds
form within mantle keels.
,5. Carbonado - ANSWER An aggregate of many randomly oriented
interlocking tiny diamond crystals that is the toughest form of diamond.
6. Carbonate - ANSWER A class of chemical compounds that contain
carbon and oxygen.
7. CLIPPIR diamonds - ANSWER Cullinan-like, Large, Inclusion-Poor, Pure,
Irregular, and Resorbed diamond.
8. Core - ANSWER The earth's innermost layer
9. Cratons - ANSWER Large, ancient, stable parts of the earth's
landmasses.
10.Crust - ANSWER The surface and outermost layer of the earth
11.Crustal diamond - ANSWER Rare diamond that forms in the continental
crust at or near the earth's surface due to meteorite impact or tectonic
plate collision.
12.Eruption - ANSWER A geological process that delivers material
(sometimes diamonds) to the surface.
13.Geothermal gradient - ANSWER The rate of temperature increase with
depth in the earth.
, 14.Igneous rock - ANSWER A rock formed from a molten state
15.Lithosphere - ANSWER A rigid layer made up of the uppermost part of
the mantle and the crust.
16.Magma - ANSWER Any molten rock within the earth.
17.Mantle - ANSWER The layer between the earth's crust and its core.
18.Mantle keels - ANSWER A large, downward-protruding portion of the
lithosphere under a craton.
19.Metamorphic rock - ANSWER A type of rock that has been altered by
heat and pressure.
20.Metasomatism - ANSWER A process in which chemical changes in
minerals and rocks result from the introduction of material from external
sources, often fluids or melts.
21.Mineral - ANSWER A natural, inorganic substance with characteristic
chemical composition and usually characteristic structure.
Actual Exam Questions With Reviewed
100% Correct Detailed Answers
Guaranteed Pass!!
1. What results from kimberlite or lamproite eruptions? - ANSWER Pipes:
What remains is a diamond-bearing pipe: a deep vertical formation that
results from a kimberlite or lamproite eruption.
2. Where do most mined diamonds form? - ANSWER Lithosphere: The
majority of diamonds mined are thought to form based on two models:
lithospheric and superdeep. Lithospheric diamonds form under cratons in
mantle keels.
3. What is an example of a superdeep diamond? - ANSWER CLIPPIR:
CLIPPIR diamonds, blue diamonds, and Brazil's Juína diamonds are three
well-studied examples of superdeep diamonds.
4. What lies beneath cratons? - ANSWER Mantle keels: The downward-
protruding shape of the lithosphere beneath a craton looks like a boat's
keel. Deepest at the center, these portions of the mantle are called mantle
keels. These depths provide the right temperatures and pressures for
diamonds to form and reside. Scientists believe the majority of diamonds
form within mantle keels.
,5. Carbonado - ANSWER An aggregate of many randomly oriented
interlocking tiny diamond crystals that is the toughest form of diamond.
6. Carbonate - ANSWER A class of chemical compounds that contain
carbon and oxygen.
7. CLIPPIR diamonds - ANSWER Cullinan-like, Large, Inclusion-Poor, Pure,
Irregular, and Resorbed diamond.
8. Core - ANSWER The earth's innermost layer
9. Cratons - ANSWER Large, ancient, stable parts of the earth's
landmasses.
10.Crust - ANSWER The surface and outermost layer of the earth
11.Crustal diamond - ANSWER Rare diamond that forms in the continental
crust at or near the earth's surface due to meteorite impact or tectonic
plate collision.
12.Eruption - ANSWER A geological process that delivers material
(sometimes diamonds) to the surface.
13.Geothermal gradient - ANSWER The rate of temperature increase with
depth in the earth.
, 14.Igneous rock - ANSWER A rock formed from a molten state
15.Lithosphere - ANSWER A rigid layer made up of the uppermost part of
the mantle and the crust.
16.Magma - ANSWER Any molten rock within the earth.
17.Mantle - ANSWER The layer between the earth's crust and its core.
18.Mantle keels - ANSWER A large, downward-protruding portion of the
lithosphere under a craton.
19.Metamorphic rock - ANSWER A type of rock that has been altered by
heat and pressure.
20.Metasomatism - ANSWER A process in which chemical changes in
minerals and rocks result from the introduction of material from external
sources, often fluids or melts.
21.Mineral - ANSWER A natural, inorganic substance with characteristic
chemical composition and usually characteristic structure.
