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Diamond & Diamond Grading Exam Study Guide Solutions Abrasion (Abr) - 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 - ANSWER-The highest degree of luster possible in a transparent ...

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  • November 10, 2024
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  • 2024/2025
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Diamond & Diamond Grading Exam Study

Guide Solutions


Abrasion (Abr) - 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 - ANSWER✔✔-The highest degree of luster possible in a transparent material.

(Assignment 8)


Aggregate - ANSWER✔✔-A solid mass of individual, randomly oriented crystals, intergrown or held

together by a natural binding agent. (Assignment 7)


Alluvial deposit - 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 - ANSWER✔✔-The angle at which a ray of light strikes a surface, measured from the

normal. (Assignment 8)


Angle of reflection - ANSWER✔✔-The angle between the normal and a reflected ray of light.

(Assignment 8)


Annealing - ANSWER✔✔-Using heat to stabilize irradiated color in gemstones. (Assignment 12)


Appraisal - ANSWER✔✔-An estimation of the value of an article, usually for insurance purposes.

(Assignment 1)




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Average girdle diameter - ANSWER✔✔-The result achieved by adding the smallest and largest girdle

measurements of a round brilliant and dividing by two. (Assignment 14)


Bast - ANSWER✔✔-Frosted rough diamond. "Bark" in Dutch. (Assignment 9)


Bearded Girdle (BG) - ANSWER✔✔-Very small feathers that extend from the girdle surface into the

stone; can result from the cutting process. (Assignment 10)


Belly - ANSWER✔✔-The slightly curving center of the long side of a pear, marquise, heart, or oval.

(Assignment 16)


Beneficiation - 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) - ANSWER✔✔-De Beers' formalized commitment of itself and its

sightholders to the highest ethical standards. (Assignment 3)


Blemish - ANSWER✔✔-Clarity characteristic that's confined to the surface of a polished gemstone.

(Assignment 10)


Block caving - 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 - ANSWER✔✔-Placing the first 17 or 18 facets on a diamond. (Assignment 9)


Bow-tie - ANSWER✔✔-A dark area across the center of an elongated brilliant cut. (Assignment 16)


Brick-and-mortar retailer - ANSWER✔✔-A traditional store consisting of walls and a fixed location.

(Assignment 3)




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Brightness - ANSWER✔✔-The effect of all the diamond's internal and external reflections of white light.

(Assignment 8)


Brilliant cut - ANSWER✔✔-A cutting style in which triangular and kite-shaped facets radiate from a gem's

center toward its girdle. (Assignment 16)


Brillianteering - ANSWER✔✔-Placement and polishing of the star and upper and lower girdle facets.

(Assignment 9)


Bruise (Br) - 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 - ANSWER✔✔-Forming the basic face-up outline of a diamond to prepare it for faceting.

(Assignment 9)


Bulk sampling - ANSWER✔✔-Large-scale character sampling. (Assignment 5)


Burn Marks (Brn) - 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) - ANSWER✔✔-An angular opening created when part of a feather breaks away. (Assignment

10)


Central Selling Organisation (CSO) - ANSWER✔✔-An agency designed to purchase, sort, evaluate, and

sell rough diamonds. (Assignment 2)


Character sampling - ANSWER✔✔-Testing for the size, shape, clarity, and color of the diamonds in a

deposit. (Assignment 5)


Characteristic color - ANSWER✔✔-The basic color of a fancy-colored diamond. (Assignment 13)


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Chemical vapor deposition (CVD) - ANSWER✔✔-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) - ANSWER✔✔-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 - ANSWER✔✔-Internal or external feature of a gemstone that helps determine its

quality and establish its identity. (Assignment 10)


Cleavage (Cl) - ANSWER✔✔-Large, severe, straight break along a plane of atomic weakness; considered

an inclusion. (Assignment 10)


Cleavage plane - ANSWER✔✔-Plane parallel to a possible crystal face, where a diamond can split cleanly

when struck. (Assignment 7)


Cleaver - ANSWER✔✔-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 - ANSWER✔✔-Dividing a diamond into two or more pieces along a cleavage plane. (Assignment

9)


Cloud (Cld) - ANSWER✔✔-Many tightly grouped pinpoints that might be too small to distinguish

individually at 10X but together have a hazy appearance. (Assignment 10)


Color center - ANSWER✔✔-Structural defect that influences an object's absorption of light and can cause

its color. (Assignment 12)


Conflict diamonds - ANSWER✔✔-Diamonds used to finance violence and terror. (Assignment 3)




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