GIA Diamonds and Diamond Grading
Final Exam #2 Graded A+
3.52 - ANSWER-What is the specific gravity of a gem-quality diamond?
37% - ANSWER-What pavilion depth percentage might reflect the girdle face-up
through the table?
8 - ANSWER-How many star facet lengths on a round brilliant diamond are estimated
before averaging?
90-140 miles (140-220 km) - ANSWER-How far beneath the earth do diamonds form?
A diamond's absorption of visible light, portions or UV light and infrared regions close to
the visible range - ANSWER-What can UV-Vis-NIR spectroscopy help identify?
A good sign that a pipe is nearby - ANSWER-What might black spinel in a mineral
sample indicate?
Allowing for greater weight retention from rough - ANSWER-The rotary saw contributed
to the diamond cutting industry by
Annealing - ANSWER-Using heat to stabilize irradiated color in gemstones
- when used following irradiation (2-step process) it produces brown, orange, or yellow
and can rarely produce pink, red, or purple
Annealing - ANSWER-What diamond color treatment further modifies color by allowing
vacancies and trace elements to diffuse post-irradiation?
As a diamond's pavilion gets deeper, its table reflection becomes... - ANSWER-Larger
At every step - ANSWER-When should the origin of a lab-grown diamond be disclosed?
Baby Boomers - ANSWER-What generation was first to connect with diamonds as a
representation of lifetime commitment?
Blemishes - ANSWER-What clarity characteristic is found only on the surface of a
gemstone?
Blocker - ANSWER-Polishes the crown and pavilion mains
Bourse - ANSWER-A diamond buying and selling club (they have them in trading
centers)
, Brazil - ANSWER-Where are rocks and geological structures similar to Africa found due
to ancient connections?
Brillianteering - ANSWER-Polishing of the star and upper and lower half facets
Bruise - ANSWER-A surface indentation with tiny, root-like feathers penetrating the
stone is called a _____
Bruting - ANSWER-What made true round-shaped diamonds possible?
Calibration - ANSWER-What does an electronic scale require immediately after is it
leveled for accurate measurement?
Cavity - ANSWER-What clarity characteristic results when a crystal is expelled?
Chambering - ANSWER-An older underground mining technique
- expensive and dangerous (no longer used)
- block caving is the alternative to this
Character sampling - ANSWER-What type of sampling gives an initial idea of diamond
quality for a deposit?
Cleavage - ANSWER-What is a smooth, flat break in a crystal parallel to a cleavage
plane?
Cleaving - ANSWER-What process splits diamond rough along its cleavage plane?
CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond - ANSWER-What is an
example of a superdeep diamond?
Cloud - ANSWER-Many tightly grouped pinpoints
Cloud or pinpoint - ANSWER-What kind of clarity characteristic is not seen at 10x mag.?
Color - ANSWER-How are gem-quality rough diamonds sorted?
Color center - ANSWER-What influences light absorption, resulting in bodycolor?
Craftsmanship - ANSWER-The care that goes into the fashioning of a polished
diamond, as confirmed by its finish
Crystal structure - ANSWER-What is another term for crystal lattice?
Cubic (runs horizontal), octahedral (on face), dodecahedral (runs vertical) - ANSWER-
What are diamond's 3 internal crystal planes?
Final Exam #2 Graded A+
3.52 - ANSWER-What is the specific gravity of a gem-quality diamond?
37% - ANSWER-What pavilion depth percentage might reflect the girdle face-up
through the table?
8 - ANSWER-How many star facet lengths on a round brilliant diamond are estimated
before averaging?
90-140 miles (140-220 km) - ANSWER-How far beneath the earth do diamonds form?
A diamond's absorption of visible light, portions or UV light and infrared regions close to
the visible range - ANSWER-What can UV-Vis-NIR spectroscopy help identify?
A good sign that a pipe is nearby - ANSWER-What might black spinel in a mineral
sample indicate?
Allowing for greater weight retention from rough - ANSWER-The rotary saw contributed
to the diamond cutting industry by
Annealing - ANSWER-Using heat to stabilize irradiated color in gemstones
- when used following irradiation (2-step process) it produces brown, orange, or yellow
and can rarely produce pink, red, or purple
Annealing - ANSWER-What diamond color treatment further modifies color by allowing
vacancies and trace elements to diffuse post-irradiation?
As a diamond's pavilion gets deeper, its table reflection becomes... - ANSWER-Larger
At every step - ANSWER-When should the origin of a lab-grown diamond be disclosed?
Baby Boomers - ANSWER-What generation was first to connect with diamonds as a
representation of lifetime commitment?
Blemishes - ANSWER-What clarity characteristic is found only on the surface of a
gemstone?
Blocker - ANSWER-Polishes the crown and pavilion mains
Bourse - ANSWER-A diamond buying and selling club (they have them in trading
centers)
, Brazil - ANSWER-Where are rocks and geological structures similar to Africa found due
to ancient connections?
Brillianteering - ANSWER-Polishing of the star and upper and lower half facets
Bruise - ANSWER-A surface indentation with tiny, root-like feathers penetrating the
stone is called a _____
Bruting - ANSWER-What made true round-shaped diamonds possible?
Calibration - ANSWER-What does an electronic scale require immediately after is it
leveled for accurate measurement?
Cavity - ANSWER-What clarity characteristic results when a crystal is expelled?
Chambering - ANSWER-An older underground mining technique
- expensive and dangerous (no longer used)
- block caving is the alternative to this
Character sampling - ANSWER-What type of sampling gives an initial idea of diamond
quality for a deposit?
Cleavage - ANSWER-What is a smooth, flat break in a crystal parallel to a cleavage
plane?
Cleaving - ANSWER-What process splits diamond rough along its cleavage plane?
CLIPPIR diamonds, blue diamonds, Brazil's Junia diamond - ANSWER-What is an
example of a superdeep diamond?
Cloud - ANSWER-Many tightly grouped pinpoints
Cloud or pinpoint - ANSWER-What kind of clarity characteristic is not seen at 10x mag.?
Color - ANSWER-How are gem-quality rough diamonds sorted?
Color center - ANSWER-What influences light absorption, resulting in bodycolor?
Craftsmanship - ANSWER-The care that goes into the fashioning of a polished
diamond, as confirmed by its finish
Crystal structure - ANSWER-What is another term for crystal lattice?
Cubic (runs horizontal), octahedral (on face), dodecahedral (runs vertical) - ANSWER-
What are diamond's 3 internal crystal planes?
