Diamond & Diamond Grading Exam || Needed to Pass. A+
Verified. 2025/2026.
Abrasion (Abr) correct 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 correct answers The highest degree of luster possible in a transparent
material. (Assignment 8)
Aggregate correct answers A solid mass of individual, randomly oriented crystals, intergrown
or held together by a natural binding agent. (Assignment 7)
Alluvial deposit correct 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 correct answers The angle at which a ray of light strikes a surface,
measured from the normal. (Assignment 8)
Angle of reflection correct answers The angle between the normal and a reflected ray of light.
(Assignment 8)
Annealing correct answers Using heat to stabilize irradiated color in gemstones. (Assignment
12)
Appraisal correct answers An estimation of the value of an article, usually for insurance
purposes. (Assignment 1)
Average girdle diameter correct answers The result achieved by adding the smallest and
largest girdle measurements of a round brilliant and dividing by two. (Assignment 14)
Bast correct answers Frosted rough diamond. "Bark" in Dutch. (Assignment 9)
Bearded Girdle (BG) correct answers Very small feathers that extend from the girdle surface
into the stone; can result from the cutting process. (Assignment 10)
Belly correct answers The slightly curving center of the long side of a pear, marquise, heart,
or oval. (Assignment 16)
Beneficiation correct 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) correct answers De Beers' formalized commitment of itself
and its sightholders to the highest ethical standards. (Assignment 3)
Blemish correct answers Clarity characteristic that's confined to the surface of a polished
gemstone. (Assignment 10)
,Block caving correct 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 correct answers Placing the first 17 or 18 facets on a diamond. (Assignment 9)
Bow-tie correct answers A dark area across the center of an elongated brilliant cut.
(Assignment 16)
Brick-and-mortar retailer correct answers A traditional store consisting of walls and a fixed
location. (Assignment 3)
Brightness correct answers The effect of all the diamond's internal and external reflections of
white light. (Assignment 8)
Brilliant cut correct answers A cutting style in which triangular and kite-shaped facets radiate
from a gem's center toward its girdle. (Assignment 16)
Brillianteering correct answers Placement and polishing of the star and upper and lower
girdle facets. (Assignment 9)
Bruise (Br) correct answers A tiny area of impact accompanied by very small, root-like
feathers visible at 10X magnification; typically occurs at a facet junction. (Assignment 10)
Bruting correct answers Forming the basic face-up outline of a diamond to prepare it for
faceting. (Assignment 9)
Bulk sampling correct answers Large-scale character sampling. (Assignment 5)
Burn Marks (Brn) correct answers Hazy surface areas that result from excessive heat or from
uneven polishing caused by structural irregularities; also called polish marks or burned facets.
(Assignment 10)
Cavity (Cv) correct answers An angular opening created when part of a feather breaks away.
(Assignment 10)
Central Selling Organisation (CSO) correct answers An agency designed to purchase, sort,
evaluate, and sell rough diamonds. (Assignment 2)
Character sampling correct answers Testing for the size, shape, clarity, and color of the
diamonds in a deposit. (Assignment 5)
Characteristic color correct answers The basic color of a fancy-colored diamond.
(Assignment 13)
Chemical vapor deposition (CVD) correct answers An industrial process adapted to allow
growth of synthetic diamond from carbon-rich gas in thin layers onto a silicon or diamond
surface. (Assignment 19)
, Chip (Ch) correct answers A shallow opening caused by damage to the stone's surface;
typically occurs at a girdle edge, facet junction, or culet. (Assignment 10)
Clarity characteristic correct answers Internal or external feature of a gemstone that helps
determine its quality and establish its identity. (Assignment 10)
Cleavage (Cl) correct answers Large, severe, straight break along a plane of atomic
weakness; considered an inclusion. (Assignment 10)
Cleavage plane correct answers Plane parallel to a possible crystal face, where a diamond can
split cleanly when struck. (Assignment 7)
Cleaver correct answers A person who cleaves, or splits, a diamond along a cleavage plane.
The cleaver might also be responsible for planning the fashioning of a polished gem.
(Assignment 9)
Cleaving correct answers Dividing a diamond into two or more pieces along a cleavage
plane. (Assignment 9)
Cloud (Cld) correct answers Many tightly grouped pinpoints that might be too small to
distinguish individually at 10X but together have a hazy appearance. (Assignment 10)
Color center correct answers Structural defect that influences an object's absorption of light
and can cause its color. (Assignment 12)
Conflict diamonds correct answers Diamonds used to finance violence and terror.
(Assignment 3)
Consignment correct answers A selection of goods loaned to a dealer by another wholesaler
or manufacturer. (Assignment 20)
Core correct answers Earth's innermost layer. (Assignment 4)
Covalent bond correct answers A chemical bond formed by two atoms sharing electrons.
(Assignment 7)
Craftsmanship correct answers The care that goes into the fashioning of a polished diamond,
as confirmed by its finish. (Assignment 15)
Cratons correct answers Ancient, large, and stable parts of the earth's continental crust.
(Assignment 4)
Critical angle correct answers Angle between the normal and the maximum angle of
refraction, which is the largest angle at which rays inside the diamond can escape.
(Assignment 8)
Cross worker correct answers A person who performs the cross-working operations during
diamond polishing; sometimes called a cross cutter. (Assignment 9)
Verified. 2025/2026.
Abrasion (Abr) correct 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 correct answers The highest degree of luster possible in a transparent
material. (Assignment 8)
Aggregate correct answers A solid mass of individual, randomly oriented crystals, intergrown
or held together by a natural binding agent. (Assignment 7)
Alluvial deposit correct 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 correct answers The angle at which a ray of light strikes a surface,
measured from the normal. (Assignment 8)
Angle of reflection correct answers The angle between the normal and a reflected ray of light.
(Assignment 8)
Annealing correct answers Using heat to stabilize irradiated color in gemstones. (Assignment
12)
Appraisal correct answers An estimation of the value of an article, usually for insurance
purposes. (Assignment 1)
Average girdle diameter correct answers The result achieved by adding the smallest and
largest girdle measurements of a round brilliant and dividing by two. (Assignment 14)
Bast correct answers Frosted rough diamond. "Bark" in Dutch. (Assignment 9)
Bearded Girdle (BG) correct answers Very small feathers that extend from the girdle surface
into the stone; can result from the cutting process. (Assignment 10)
Belly correct answers The slightly curving center of the long side of a pear, marquise, heart,
or oval. (Assignment 16)
Beneficiation correct 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) correct answers De Beers' formalized commitment of itself
and its sightholders to the highest ethical standards. (Assignment 3)
Blemish correct answers Clarity characteristic that's confined to the surface of a polished
gemstone. (Assignment 10)
,Block caving correct 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 correct answers Placing the first 17 or 18 facets on a diamond. (Assignment 9)
Bow-tie correct answers A dark area across the center of an elongated brilliant cut.
(Assignment 16)
Brick-and-mortar retailer correct answers A traditional store consisting of walls and a fixed
location. (Assignment 3)
Brightness correct answers The effect of all the diamond's internal and external reflections of
white light. (Assignment 8)
Brilliant cut correct answers A cutting style in which triangular and kite-shaped facets radiate
from a gem's center toward its girdle. (Assignment 16)
Brillianteering correct answers Placement and polishing of the star and upper and lower
girdle facets. (Assignment 9)
Bruise (Br) correct answers A tiny area of impact accompanied by very small, root-like
feathers visible at 10X magnification; typically occurs at a facet junction. (Assignment 10)
Bruting correct answers Forming the basic face-up outline of a diamond to prepare it for
faceting. (Assignment 9)
Bulk sampling correct answers Large-scale character sampling. (Assignment 5)
Burn Marks (Brn) correct answers Hazy surface areas that result from excessive heat or from
uneven polishing caused by structural irregularities; also called polish marks or burned facets.
(Assignment 10)
Cavity (Cv) correct answers An angular opening created when part of a feather breaks away.
(Assignment 10)
Central Selling Organisation (CSO) correct answers An agency designed to purchase, sort,
evaluate, and sell rough diamonds. (Assignment 2)
Character sampling correct answers Testing for the size, shape, clarity, and color of the
diamonds in a deposit. (Assignment 5)
Characteristic color correct answers The basic color of a fancy-colored diamond.
(Assignment 13)
Chemical vapor deposition (CVD) correct answers An industrial process adapted to allow
growth of synthetic diamond from carbon-rich gas in thin layers onto a silicon or diamond
surface. (Assignment 19)
, Chip (Ch) correct answers A shallow opening caused by damage to the stone's surface;
typically occurs at a girdle edge, facet junction, or culet. (Assignment 10)
Clarity characteristic correct answers Internal or external feature of a gemstone that helps
determine its quality and establish its identity. (Assignment 10)
Cleavage (Cl) correct answers Large, severe, straight break along a plane of atomic
weakness; considered an inclusion. (Assignment 10)
Cleavage plane correct answers Plane parallel to a possible crystal face, where a diamond can
split cleanly when struck. (Assignment 7)
Cleaver correct answers A person who cleaves, or splits, a diamond along a cleavage plane.
The cleaver might also be responsible for planning the fashioning of a polished gem.
(Assignment 9)
Cleaving correct answers Dividing a diamond into two or more pieces along a cleavage
plane. (Assignment 9)
Cloud (Cld) correct answers Many tightly grouped pinpoints that might be too small to
distinguish individually at 10X but together have a hazy appearance. (Assignment 10)
Color center correct answers Structural defect that influences an object's absorption of light
and can cause its color. (Assignment 12)
Conflict diamonds correct answers Diamonds used to finance violence and terror.
(Assignment 3)
Consignment correct answers A selection of goods loaned to a dealer by another wholesaler
or manufacturer. (Assignment 20)
Core correct answers Earth's innermost layer. (Assignment 4)
Covalent bond correct answers A chemical bond formed by two atoms sharing electrons.
(Assignment 7)
Craftsmanship correct answers The care that goes into the fashioning of a polished diamond,
as confirmed by its finish. (Assignment 15)
Cratons correct answers Ancient, large, and stable parts of the earth's continental crust.
(Assignment 4)
Critical angle correct answers Angle between the normal and the maximum angle of
refraction, which is the largest angle at which rays inside the diamond can escape.
(Assignment 8)
Cross worker correct answers A person who performs the cross-working operations during
diamond polishing; sometimes called a cross cutter. (Assignment 9)
