DIAMOND DIAMOND GRADING EXAM 470 QUESTIONS WITH

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DIAMOND & DIAMOND GRADING EXAM/ /470 QUESTIONS WITH

CORRECT DETAILED ANSWERS/A+ GRADE/ NEWEST UPDATE FALL

2024-2025

• Abrasion (Abr) -ANS:->> A series of minute nicks along the facet junctions of a

fashioned diamond; gives the edges a white or fuzzy appearance. (Assignment 10)

2. Adamantine luster -ANS:->> The highest degree of luster possible in

a transparent mate- rial. (Assignment 8)

• Aggregate -ANS:->> A solid mass of individual, randomly oriented crystals,

intergrown or held together by a natural binding agent. (Assignment 7)

• Alluvial deposit -ANS:->> A deposit where gems are eroded from their source

rock, then transported away from the source and further concentrated. (Assignment 5)

• Angle of incidence -ANS:->> The angle at which a ray of light strikes a surface,

measured from the normal. (Assignment 8)

• Angle of reflection -ANS:->> The angle between the normal and a reflected ray

of light. (Assignment 8)

• Annealing -ANS:->> Using heat to stabilize irradiated color in gemstones.

(Assignment 12)

8. Appraisal -ANS:->> An estimation of the value of an article, usually

for insurance purposes. (Assignment 1)

• Average girdle diameter -ANS:->> The result achieved by adding the smallest 1 / 4

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

• Bast -ANS:->> Frosted rough diamond. "Bark" in Dutch. (Assignment 9)

• Bearded Girdle (BG) -ANS:->> Very small feathers that extend from the girdle

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

12. Belly -ANS:->> The slightly curving center of the long side of a

pear, marquise, heart, or oval. (Assignment 16)

• Beneficiation -ANS:->> 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) -ANS:->> De Beers' formalized commitment of

itself and its sightholders to the highest ethical standards. (Assignment 3)

• Blemish -ANS:->> Clarity characteristic that's confined to the surface of a

polished gem- stone. (Assignment 10)

• Block caving -ANS:->> Underground mining that involves building a concrete-

lined tun- nel under an ore deposit, then collecting the ore through openings in the liner.(Assignment 6)

• Blocking -ANS:->> Placing the first 17 or 18 facets on a diamond. (Assignment 9)
• Bow-tie -ANS:->> A dark area across the center of an elongated brilliant cut. 2 / 4

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(Assignment 16)

• Brick-and-mortar retailer -ANS:->> A traditional store consisting of walls and

a fixed location. (Assignment 3)

• Brightness -ANS:->> The effect of all the diamond's internal and external

reflections of white light. (Assignment 8)

• Brilliant cut -ANS:->> A cutting style in which triangular and kite-shaped

facets radiate from a gem's center toward its girdle. (Assignment 16) 22.Brillianteering -ANS:->> Placement and polishing of the star and upper and lower girdle facets. (Assignment 9)

• Bruise (Br) -ANS:->> 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 -ANS:->> Forming the basic face-up outline of a diamond to prepare it for

faceting. (Assignment 9)

25. Bulk sampling -ANS:->> Large-scale character sampling. (Assignment 5)

• Burn Marks (Brn) -ANS:->> 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) -ANS:->> An angular opening created when part of a feather

breaks away. (Assignment 10)

• Central Selling Organisation (CSO) -ANS:->> An agency designed to purchase, sort,

evaluate, and sell rough diamonds. (Assignment 2) 3 / 4

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• Character sampling -ANS:->> Testing for the size, shape, clarity, and color of

the dia- monds in a deposit. (Assignment 5)

• Characteristic color -ANS:->> The basic color of a fancy-colored diamond.

(Assignment 13)

• Chemical vapor deposition (CVD) -ANS:->> 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)

32. Chip (Ch) -ANS:->> 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 -ANS:->> Internal or external feature of a gemstone that

helps determine its quality and establish its identity. (Assignment 10)

• Cleavage (Cl) -ANS:->> Large, severe, straight break along a plane of atomic

weakness; considered an inclusion. (Assignment 10)

• Cleavage plane -ANS:->> Plane parallel to a possible crystal face, where a

diamond can split cleanly when struck. (Assignment 7)

• Cleaver -ANS:->> 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)

37. Cleaving -ANS:->> Dividing a diamond into two or more pieces along a

cleavage plane. (Assignment 9)

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