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Diamond & Diamond Grading Exam
1.
Abrasion (Abr):
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:
The highest degree of luster possible in a
transparent mate- rial. (Assignment 8)
3.
Aggregate:
A solid mass of individual, randomly oriented crystals,
intergrown or held together by a natural binding agent. (Assignment 7)
4.
Alluvial deposit:
A deposit where gems are eroded from their source
rock, then transported away from the source and further concentrated.
(Assignment 5)
5.
Angle of incidence:
The angle at which a ray of light strikes a surface,
measured from the normal. (Assignment 8)
6.
Angle of reflection:
The angle between the normal and a reflected ray
of light. (Assignment 8)
7.
Annealing:
Using heat to stabilize irradiated color in gemstones.
