GIA Diamonds and Diamond grading
Exam Questions and Answers Latest
Update
Beneficiation - Answer-A commitment to reserve a portion of the resources derived from
any country for the economic development of that country.
Blemish - Answer-Clarity characteristic that's confined to the surface of a polished
gemstone. Characteristic or irregularity confined to the surface of a polished gemstone.
Blockchain - Answer-A shared, unalterable ledger used to record transactions and track
assets through a supply chain or business network.
Blocking - Answer-Placing the first 17 or 18 facets on a diamond, including the crown
and pavilion main facets, table, and sometimes a culet.
Bort - Answer-A form of industrial-grade diamond that usually occurs as very included
single crystals in a range of yellows, grays, and browns.
Bow-tie - Answer-A dark area across the center of an elongated brilliant cut.
Brightfield illumination - Answer-Lighting a diamondfrom below to create a bright
background.
Brightness - Answer-The effect of all the diamond's internal and external reflections of
white light.
Brilliant cut - Answer-Cutting style with triangular or kite-shaped facets that radiate from
the center toward the girdle.
Brillianteering - Answer-Placement and polishing of the star and upper and lower girdle
facets.
Bruting - Answer-Forming the basic face-up outline of a round or rounded shape
diamond to prepare it for faceting.
Bulk sampling - Answer-Large-scale character sampling.
Carbonado - Answer-An aggregate of many randomly oriented interlocking tiny diamond
crystals that is the toughest form of diamond.
Carbonate - Answer-A class of chemical compounds that contain carbon and oxygen.
, Catalyst - Answer-A substance that increases the rate of a chemical reaction.
Cave mining - Answer-An underground mining technique in which orebody is drilled
beneath the surface, loosened, and collected as it falls.
Central Selling Organisation (CSO) - Answer-An agency designed to purchase, sort,
evaluate, and sell rough diamonds.
Character sampling - Answer-Testing for the size, shape, clarity, and color of the
diamonds in a deposit.
Characteristic color - Answer-The basic face-up color of a colored diamond.
Clarity characteristic - Answer-Internal or external feature of a gemstone that helps
determine its quality.
Cleavage - Answer-A smooth, flat break in a gemstone parallel to planes of atomic
weakness.
Cleavage plane - Answer-Plane parallel to a possible crystal face, where a diamond can
split cleanly when struck.
Cleaving - Answer-Dividing a diamond into two or more pieces along a cleavage plane.
CLIPPIR diamonds - Answer-Cullinan-like, Large, Inclusion-Poor, Pure, Irregular, and
Resorbed diamond.
Color center - Answer-A small defect in the atomic structure of a material that can
absorb light and give rise to a color. Structural defect that influences an object's
absorption of light and can cause its color.
Color lamellae - Answer-Closely spaced grain lines where color concentrates.
Coning - Answer-The process of forming the pavilion angle by gradually polishing off the
extra material at different angles.
Consignment - Answer-A selection of goods loaned to a dealer by another wholesaler or
a gem cutter.
Core - Answer-Earth's innermost layer.
Cost-plus model - Answer-Model in which final sale price is based on the cost to
produce the product plus a small markup.
Covalent bond - Answer-A chemical bond formed by two atoms sharing electrons.
Exam Questions and Answers Latest
Update
Beneficiation - Answer-A commitment to reserve a portion of the resources derived from
any country for the economic development of that country.
Blemish - Answer-Clarity characteristic that's confined to the surface of a polished
gemstone. Characteristic or irregularity confined to the surface of a polished gemstone.
Blockchain - Answer-A shared, unalterable ledger used to record transactions and track
assets through a supply chain or business network.
Blocking - Answer-Placing the first 17 or 18 facets on a diamond, including the crown
and pavilion main facets, table, and sometimes a culet.
Bort - Answer-A form of industrial-grade diamond that usually occurs as very included
single crystals in a range of yellows, grays, and browns.
Bow-tie - Answer-A dark area across the center of an elongated brilliant cut.
Brightfield illumination - Answer-Lighting a diamondfrom below to create a bright
background.
Brightness - Answer-The effect of all the diamond's internal and external reflections of
white light.
Brilliant cut - Answer-Cutting style with triangular or kite-shaped facets that radiate from
the center toward the girdle.
Brillianteering - Answer-Placement and polishing of the star and upper and lower girdle
facets.
Bruting - Answer-Forming the basic face-up outline of a round or rounded shape
diamond to prepare it for faceting.
Bulk sampling - Answer-Large-scale character sampling.
Carbonado - Answer-An aggregate of many randomly oriented interlocking tiny diamond
crystals that is the toughest form of diamond.
Carbonate - Answer-A class of chemical compounds that contain carbon and oxygen.
, Catalyst - Answer-A substance that increases the rate of a chemical reaction.
Cave mining - Answer-An underground mining technique in which orebody is drilled
beneath the surface, loosened, and collected as it falls.
Central Selling Organisation (CSO) - Answer-An agency designed to purchase, sort,
evaluate, and sell rough diamonds.
Character sampling - Answer-Testing for the size, shape, clarity, and color of the
diamonds in a deposit.
Characteristic color - Answer-The basic face-up color of a colored diamond.
Clarity characteristic - Answer-Internal or external feature of a gemstone that helps
determine its quality.
Cleavage - Answer-A smooth, flat break in a gemstone parallel to planes of atomic
weakness.
Cleavage plane - Answer-Plane parallel to a possible crystal face, where a diamond can
split cleanly when struck.
Cleaving - Answer-Dividing a diamond into two or more pieces along a cleavage plane.
CLIPPIR diamonds - Answer-Cullinan-like, Large, Inclusion-Poor, Pure, Irregular, and
Resorbed diamond.
Color center - Answer-A small defect in the atomic structure of a material that can
absorb light and give rise to a color. Structural defect that influences an object's
absorption of light and can cause its color.
Color lamellae - Answer-Closely spaced grain lines where color concentrates.
Coning - Answer-The process of forming the pavilion angle by gradually polishing off the
extra material at different angles.
Consignment - Answer-A selection of goods loaned to a dealer by another wholesaler or
a gem cutter.
Core - Answer-Earth's innermost layer.
Cost-plus model - Answer-Model in which final sale price is based on the cost to
produce the product plus a small markup.
Covalent bond - Answer-A chemical bond formed by two atoms sharing electrons.
