DIAMOND & DIAMOND
GRADING EXAM
the angle of incidence always... - ANSWERS-equals the angle of
reflection
T/F: a materials optical density affects the speed of light that passes
through it - ANSWERS-TRUE
T/F: light rays that enter at the maximum angle of refraction form a
critical angle cone inside the diamond - ANSWERS-TRUE
The higher a gems RI... - ANSWERS-the smaller its critical angle
T/F: all diamonds have the same dispertion value - ANSWERS-TRUE
diffrences in diamond cut bring out differing amounts of... -
ANSWERS-fire
a diamonds face up pattern reveals... - ANSWERS-almost all of the
cutters fashioning choices
GIA diamond cut grades apply to... - ANSWERS-standard, round
brilliants in all clarities across the D to Z color range
,T/F: variations in lighting and surrounding cannot affect a diamonds
appearance - ANSWERS-FALSE, lighting and surrounding CAN
affect a diamonds appearance
What does spotlighting help you evalute? - ANSWERS-a diamonds
fire
What does diffused florescent lighting help you evaluate? -
ANSWERS-a diamonds brightness
admantine luster - ANSWERS-the highest degree of luster possible in
a transparent material
angle of incidence - ANSWERS-the angle at which a ray of light
strikes a surface, mesasured from the normal
angle of reflection - ANSWERS-the angle between the mornal and a
reflected ray of light
Abrasion (Abr) - ANSWERS-A series of minute nicks along the facet
junctions of a fashioned diamond; gives the edges a white or fuzzy
appearance. (Assignment 10)
Adamantine luster - ANSWERS-The highest degree of luster possible
in a transparent material. (Assignment 8)
,Aggregate - ANSWERS-A solid mass of individual, randomly
oriented crystals, intergrown or held together by a natural binding
agent. (Assignment 7)
Alluvial deposit - ANSWERS-A deposit where gems are eroded from
their source rock, then transported away from the source and further
concentrated. (Assignment 5)
Angle of incidence - ANSWERS-The angle at which a ray of light
strikes a surface, measured from the normal. (Assignment 8)
Angle of reflection - ANSWERS-The angle between the normal and a
reflected ray of light. (Assignment 8)
Annealing - ANSWERS-Using heat to stabilize irradiated color in
gemstones. (Assignment 12)
Appraisal - ANSWERS-An estimation of the value of an article,
usually for insurance purposes. (Assignment 1)
Average girdle diameter - ANSWERS-The result achieved by adding
the smallest and largest girdle measurements of a round brilliant and
dividing by two. (Assignment 14)
Bast - ANSWERS-Frosted rough diamond. "Bark" in Dutch.
(Assignment 9)
, Bearded Girdle (BG) - ANSWERS-Very small feathers that extend
from the girdle surface into the stone; can result from the cutting
process. (Assignment 10)
Belly - ANSWERS-The slightly curving center of the long side of a
pear, marquise, heart, or oval. (Assignment 16)
Beneficiation - ANSWERS-A commitment to reserve a portion of the
resources derived from any country for the economic development of
that country. (Assignment 3)
Best Practices Principles (BPP) - ANSWERS-De Beers' formalized
commitment of itself and its sightholders to the highest ethical
standards. (Assignment 3)
Blemish - ANSWERS-Clarity characteristic that's confined to the
surface of a polished gemstone. (Assignment 10)
Block caving - ANSWERS-Underground mining that involves
building a concrete-lined tunnel under an ore deposit, then collecting
the ore through openings in the liner. (Assignment 6)
Blocking - ANSWERS-Placing the first 17 or 18 facets on a diamond.
(Assignment 9)
Bow-tie - ANSWERS-A dark area across the center of an elongated
brilliant cut. (Assignment 16)
GRADING EXAM
the angle of incidence always... - ANSWERS-equals the angle of
reflection
T/F: a materials optical density affects the speed of light that passes
through it - ANSWERS-TRUE
T/F: light rays that enter at the maximum angle of refraction form a
critical angle cone inside the diamond - ANSWERS-TRUE
The higher a gems RI... - ANSWERS-the smaller its critical angle
T/F: all diamonds have the same dispertion value - ANSWERS-TRUE
diffrences in diamond cut bring out differing amounts of... -
ANSWERS-fire
a diamonds face up pattern reveals... - ANSWERS-almost all of the
cutters fashioning choices
GIA diamond cut grades apply to... - ANSWERS-standard, round
brilliants in all clarities across the D to Z color range
,T/F: variations in lighting and surrounding cannot affect a diamonds
appearance - ANSWERS-FALSE, lighting and surrounding CAN
affect a diamonds appearance
What does spotlighting help you evalute? - ANSWERS-a diamonds
fire
What does diffused florescent lighting help you evaluate? -
ANSWERS-a diamonds brightness
admantine luster - ANSWERS-the highest degree of luster possible in
a transparent material
angle of incidence - ANSWERS-the angle at which a ray of light
strikes a surface, mesasured from the normal
angle of reflection - ANSWERS-the angle between the mornal and a
reflected ray of light
Abrasion (Abr) - ANSWERS-A series of minute nicks along the facet
junctions of a fashioned diamond; gives the edges a white or fuzzy
appearance. (Assignment 10)
Adamantine luster - ANSWERS-The highest degree of luster possible
in a transparent material. (Assignment 8)
,Aggregate - ANSWERS-A solid mass of individual, randomly
oriented crystals, intergrown or held together by a natural binding
agent. (Assignment 7)
Alluvial deposit - ANSWERS-A deposit where gems are eroded from
their source rock, then transported away from the source and further
concentrated. (Assignment 5)
Angle of incidence - ANSWERS-The angle at which a ray of light
strikes a surface, measured from the normal. (Assignment 8)
Angle of reflection - ANSWERS-The angle between the normal and a
reflected ray of light. (Assignment 8)
Annealing - ANSWERS-Using heat to stabilize irradiated color in
gemstones. (Assignment 12)
Appraisal - ANSWERS-An estimation of the value of an article,
usually for insurance purposes. (Assignment 1)
Average girdle diameter - ANSWERS-The result achieved by adding
the smallest and largest girdle measurements of a round brilliant and
dividing by two. (Assignment 14)
Bast - ANSWERS-Frosted rough diamond. "Bark" in Dutch.
(Assignment 9)
, Bearded Girdle (BG) - ANSWERS-Very small feathers that extend
from the girdle surface into the stone; can result from the cutting
process. (Assignment 10)
Belly - ANSWERS-The slightly curving center of the long side of a
pear, marquise, heart, or oval. (Assignment 16)
Beneficiation - ANSWERS-A commitment to reserve a portion of the
resources derived from any country for the economic development of
that country. (Assignment 3)
Best Practices Principles (BPP) - ANSWERS-De Beers' formalized
commitment of itself and its sightholders to the highest ethical
standards. (Assignment 3)
Blemish - ANSWERS-Clarity characteristic that's confined to the
surface of a polished gemstone. (Assignment 10)
Block caving - ANSWERS-Underground mining that involves
building a concrete-lined tunnel under an ore deposit, then collecting
the ore through openings in the liner. (Assignment 6)
Blocking - ANSWERS-Placing the first 17 or 18 facets on a diamond.
(Assignment 9)
Bow-tie - ANSWERS-A dark area across the center of an elongated
brilliant cut. (Assignment 16)
