GIA DIAMOND ESSENTIALS ASSIGNMENT 2 QUESTIONS
WITH CORRECT ANSWERS
Plot - CORRECT ANSWER -a color-keyed diagram of a gemstone's significant clarity
characteristics; it can be modified for diamonds of any shape. when complete, a plot simplifies
the task of finding a diamond's clarity characteristics.
clarity is also known as ... - CORRECT ANSWER -purity, or quality (in Europe)
Clarity characteristics form appear at different stages: - CORRECT ANSWER -during or after
formation, can be also caused by cutting or setting process, or even occur when the diamond is
being worned.
loupe - CORRECT ANSWER -a small portable magnifying lens used by jewelers and watchmakers;
from 4X to 30X;
binocular microscope - CORRECT ANSWER -A tabletop magnifier with two eyepieces
10X - CORRECT ANSWER -10X magnification is the standard clarity grading.
Graining 晶纹 - CORRECT ANSWER -Sometimes as a crystal grows it develops irregularities in its
atomic structure. When that happens, it forms a clarity characteristic called graining. Graining
often looks like faint lines or streaks. Sometimes the lines are parallel, and sometimes they
intersect.
break/feather (cleavage and fracture) - CORRECT ANSWER -Cleavage is a break parallel to the
weakest direction in the gem's structure. It sometimes has a step-like appearance. A fracture is
a break in any other direction. In the trade, cleavages and fractures are generally called
feathers. That's because they have a white, feathery appearance.
, inclusion types - CORRECT ANSWER -
Clarity Grading Factors - CORRECT ANSWER -size; number; location (position); relief (the
contrast between the inclusion and the diamond); nature (type of inclusion).
one or two large inclusions usually set the grade; a reflector can lower the grade more than
non-reflectors (a reflector in the pavilion can make it looks like many...); inclusions right under
the table are more visible than other locations like under the bezel facets or near the girdle;
Bruting/round up/girdling - CORRECT ANSWER -Forming the basic face-up outline of a round or
rounded-shape diamond to prepare it for faceting; can cause bearding
Bearding - CORRECT ANSWER -Small feathers that extend from the surface of the girdle into the
stone [inclusion]
Natural (N) - CORRECT ANSWER -a portion of the original surface of a rough diamond left on a
fashioned stone; usually on or near the girdle. [blemish]
Chip (Ch) - CORRECT ANSWER -A shallow opening that occurs at a girdle edge, facet junction, or
culet; is caused by damage to the stone surface [inclusion]
Polish Lines (PL) - CORRECT ANSWER -fine parallel grooves and ridges left by polishing; do not
pass facet junction, transparent or white [blemish]
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. [inclusion]
Cavity (Cav) - CORRECT ANSWER -An opening on the surface that occurs when part of a feather
breaks away, or when a crystal drops out/is forced out, typically during polishing. [inclusion]
WITH CORRECT ANSWERS
Plot - CORRECT ANSWER -a color-keyed diagram of a gemstone's significant clarity
characteristics; it can be modified for diamonds of any shape. when complete, a plot simplifies
the task of finding a diamond's clarity characteristics.
clarity is also known as ... - CORRECT ANSWER -purity, or quality (in Europe)
Clarity characteristics form appear at different stages: - CORRECT ANSWER -during or after
formation, can be also caused by cutting or setting process, or even occur when the diamond is
being worned.
loupe - CORRECT ANSWER -a small portable magnifying lens used by jewelers and watchmakers;
from 4X to 30X;
binocular microscope - CORRECT ANSWER -A tabletop magnifier with two eyepieces
10X - CORRECT ANSWER -10X magnification is the standard clarity grading.
Graining 晶纹 - CORRECT ANSWER -Sometimes as a crystal grows it develops irregularities in its
atomic structure. When that happens, it forms a clarity characteristic called graining. Graining
often looks like faint lines or streaks. Sometimes the lines are parallel, and sometimes they
intersect.
break/feather (cleavage and fracture) - CORRECT ANSWER -Cleavage is a break parallel to the
weakest direction in the gem's structure. It sometimes has a step-like appearance. A fracture is
a break in any other direction. In the trade, cleavages and fractures are generally called
feathers. That's because they have a white, feathery appearance.
, inclusion types - CORRECT ANSWER -
Clarity Grading Factors - CORRECT ANSWER -size; number; location (position); relief (the
contrast between the inclusion and the diamond); nature (type of inclusion).
one or two large inclusions usually set the grade; a reflector can lower the grade more than
non-reflectors (a reflector in the pavilion can make it looks like many...); inclusions right under
the table are more visible than other locations like under the bezel facets or near the girdle;
Bruting/round up/girdling - CORRECT ANSWER -Forming the basic face-up outline of a round or
rounded-shape diamond to prepare it for faceting; can cause bearding
Bearding - CORRECT ANSWER -Small feathers that extend from the surface of the girdle into the
stone [inclusion]
Natural (N) - CORRECT ANSWER -a portion of the original surface of a rough diamond left on a
fashioned stone; usually on or near the girdle. [blemish]
Chip (Ch) - CORRECT ANSWER -A shallow opening that occurs at a girdle edge, facet junction, or
culet; is caused by damage to the stone surface [inclusion]
Polish Lines (PL) - CORRECT ANSWER -fine parallel grooves and ridges left by polishing; do not
pass facet junction, transparent or white [blemish]
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. [inclusion]
Cavity (Cav) - CORRECT ANSWER -An opening on the surface that occurs when part of a feather
breaks away, or when a crystal drops out/is forced out, typically during polishing. [inclusion]
