GIA Diamonds & Diamond Grading Week 3 Practice Complete
Questions With Verified Solutions!!!
1. atom the basic structural unit of all matter
2. protons and neutrons form the What makes up an atom?
nucleus while electrons surround
the nucleus in or- bits, or shells
3. tetrahedron 4 carbon atoms with 1 in the middle
(total 5 carbon atoms)
4. formed from 4 tetrahedrons held How is the core of a diamond's unit
togeth- er by shared electrons in cell formed?
strong covalent bonds
5. habit characteristic crystal shape or form of
a
mineral
6. octahedron What is a diamond's habit?
7. crystal structure or crystal lattice the regular, repeating arrangement of
atoms in a mineral
8. greatly affects a mineral's characteristics What does the crystal
structure/crystal lat-
tice attect?
9. cleavage planes directions in which there are fewer
carbon atoms, with more space
between them, than in others;
planar surface along which a
mineral tends to break due to
atomic weakness
1/
23
, GIA Diamonds & Diamond Grading Week 3 Practice Complete
Questions With Verified Solutions!!!
10. a flat break parallel to a cleavage plane What would a well-placed blow
cause to a
cleavage plane?
2/
23
, GIA Diamonds & Diamond Grading Week 3 Practice Complete
Questions With Verified Solutions!!!
11. cleavage a smooth, flat break in a crystal
parallel to a cleavage plane
12. cubic crystal system What crystal system do diamonds
belong to?
13. singly refractive or isotropic Because the cubic crystal system
is the most symmetrical, these
crystals are de- scribed as...
14. cube, octahedron, & dodecahedron What are the 3 common crystal
shapes of
minerals that form in a cubic system?
15. point defect an imperfection or deviation from the
ide- al arrangement of atoms in
relation to a single atom or point in
the crystal lattice
16. intrinsic & extrinsic What are 2 types of point defects?
17. intrinsic defect a point defect created in diamond
when a carbon atom is missing from
its origi- nal position—creating a
vacancy—in the crystal lattice
18. extrinsic defect a point defect when diamonds
incorpo- rate atoms of elements not
part of their essential chemical
composition, called trace
elements, during formation
3/
23
Questions With Verified Solutions!!!
1. atom the basic structural unit of all matter
2. protons and neutrons form the What makes up an atom?
nucleus while electrons surround
the nucleus in or- bits, or shells
3. tetrahedron 4 carbon atoms with 1 in the middle
(total 5 carbon atoms)
4. formed from 4 tetrahedrons held How is the core of a diamond's unit
togeth- er by shared electrons in cell formed?
strong covalent bonds
5. habit characteristic crystal shape or form of
a
mineral
6. octahedron What is a diamond's habit?
7. crystal structure or crystal lattice the regular, repeating arrangement of
atoms in a mineral
8. greatly affects a mineral's characteristics What does the crystal
structure/crystal lat-
tice attect?
9. cleavage planes directions in which there are fewer
carbon atoms, with more space
between them, than in others;
planar surface along which a
mineral tends to break due to
atomic weakness
1/
23
, GIA Diamonds & Diamond Grading Week 3 Practice Complete
Questions With Verified Solutions!!!
10. a flat break parallel to a cleavage plane What would a well-placed blow
cause to a
cleavage plane?
2/
23
, GIA Diamonds & Diamond Grading Week 3 Practice Complete
Questions With Verified Solutions!!!
11. cleavage a smooth, flat break in a crystal
parallel to a cleavage plane
12. cubic crystal system What crystal system do diamonds
belong to?
13. singly refractive or isotropic Because the cubic crystal system
is the most symmetrical, these
crystals are de- scribed as...
14. cube, octahedron, & dodecahedron What are the 3 common crystal
shapes of
minerals that form in a cubic system?
15. point defect an imperfection or deviation from the
ide- al arrangement of atoms in
relation to a single atom or point in
the crystal lattice
16. intrinsic & extrinsic What are 2 types of point defects?
17. intrinsic defect a point defect created in diamond
when a carbon atom is missing from
its origi- nal position—creating a
vacancy—in the crystal lattice
18. extrinsic defect a point defect when diamonds
incorpo- rate atoms of elements not
part of their essential chemical
composition, called trace
elements, during formation
3/
23
