Diamond & Diamond Grading Exam; Questions
& Answers 100% Solved
Abrasion (Abr) Correct answer-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 answer-The highest degree of luster p...
Diamond & Diamond Grading Exam; Questions
& Answers 100% Solved
Abrasion (Abr) Correct answer-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 answer-The highest degree of luster possible in a transparent
material. (Assignment 8)
Aggregate Correct answer-A solid mass of individual, randomly oriented crystals,
intergrown or held together by a natural binding agent. (Assignment 7)
Alluvial deposit Correct answer-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 answer-The angle at which a ray of light strikes a surface,
measured from the normal. (Assignment 8)
Angle of reflection Correct answer-The angle between the normal and a reflected ray of
light. (Assignment 8)
Annealing Correct answer-Using heat to stabilize irradiated color in gemstones.
(Assignment 12)
,Diamond & Diamond Grading Exam; Questions
& Answers 100% Solved
Appraisal Correct answer-An estimation of the value of an article, usually for insurance
purposes. (Assignment 1)
Average girdle diameter Correct answer-The result achieved by adding the smallest and
largest girdle measurements of a round brilliant and dividing by two. (Assignment 14)
Bast Correct answer-Frosted rough diamond. "Bark" in Dutch. (Assignment 9)
Bearded Girdle (BG) Correct answer-Very small feathers that extend from the girdle
surface into the stone; can result from the cutting process. (Assignment 10)
Belly Correct answer-The slightly curving center of the long side of a pear, marquise,
heart, or oval. (Assignment 16)
Beneficiation Correct answer-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 answer-De Beers' formalized commitment of itself
and its sightholders to the highest ethical standards. (Assignment 3)
Blemish Correct answer-Clarity characteristic that's confined to the surface of a polished
gemstone. (Assignment 10)
Block caving Correct answer-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 answer-Placing the first 17 or 18 facets on a diamond. (Assignment 9)
Bow-tie Correct answer-A dark area across the center of an elongated brilliant cut.
(Assignment 16)
Brick-and-mortar retailer Correct answer-A traditional store consisting of walls and a
fixed location. (Assignment 3)
Brightness Correct answer-The effect of all the diamond's internal and external
reflections of white light. (Assignment 8)
Brilliant cut Correct answer-A cutting style in which triangular and kite-shaped facets
radiate from a gem's center toward its girdle. (Assignment 16)
Brillianteering Correct answer-Placement and polishing of the star and upper and lower
girdle facets. (Assignment 9)
, Diamond & Diamond Grading Exam; Questions
& Answers 100% Solved
Bruise (Br) Correct answer-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 answer-Forming the basic face-up outline of a diamond to prepare it for
faceting. (Assignment 9)
Bulk sampling Correct answer-Large-scale character sampling. (Assignment 5)
Burn Marks (Brn) Correct answer-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 answer-An angular opening created when part of a feather breaks
away. (Assignment 10)
Central Selling Organisation (CSO) Correct answer-An agency designed to purchase, sort,
evaluate, and sell rough diamonds. (Assignment 2)
Character sampling Correct answer-Testing for the size, shape, clarity, and color of the
diamonds in a deposit. (Assignment 5)
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