Study Questions for Sections 12, 13 & 14
Instructions: Finish answering all the questions before
proceeding to the next section.
Section 12
12.01
#1 When measuring the diameter of a diamond mounted in
a full bezel you must add a small amount to compensate for
the metal around the stone.
A. True
B. False
12.02
#1 When estimating depth on a diamond mounted in a
closed back mounting you could rely on…
A. adding a slight amount for metal thickness.
B. the Table Reflection Method.
C. the Table Bowing Method.
#2 In a ring that has employed piggy-backing the upper
diamond will typically be…
A. extremely flat.
B. extremely deep.
C. well proportioned.
12.03
#1 Which of the following methods would help estimate
crown angles?
A. The Table Reflection Method
B. The Table Bowing Method
C. The Pavilion Main Method
#2 One problem with flat crown angles is…
A. additional weight loss.
B. less contrast and diversity.
C. light being reflected back inside the diamond
instead of the planned escape route.
#3 The original ideal crown angles were…
A. 32 degrees
B. 34.5 degrees
C. 36.5 degrees
#4 One problem with high crown angles is…
A. additional weight loss.
B. less contrast and diversity.
C. light being reflected back inside the diamond
instead of the planned escape route.
#5 Of the following choices, the best angle of dispersion
is…
A. 30 degrees
B. 33 degrees
C. 29 degrees
12.04
#1 Measuring a table on a diamond in a pronged
mounting will usually be very difficult.
A. True
B. False
#2 The most accurate method of measuring a table in a
mounting is the…
A. Table Percentage Bowing Method
B. Plastic Table Gauge
C. Table Percentage Ratio Method
12.05
#1 In determining the girdle thickness in a bezel set
diamond it might be helpful to…
A. look through the back of the diamond.
B. tilt the diamond.
C. use higher magnification.
12.06
#1 In estimating pavilion depth/angle, which of the
following methods could be employed?
A. The Table Reflection Method.
B. The Table Bowing Method.
C. Either of the above.
#2 Given the following measurements/specs from
a mounted round brilliant diamond, what would your
assessment of the pavilion depth be?
Crown height: very fl at (7%)
Average Diameter: 6.32 mm
Depth measurement: 3.93 mm
Very Thin Girdle
A. Ideal
B. Flat
C. Deep
#3 Which of the following specs could create a 61.8%
depth but still be poorly proportioned?
A. An 8% crown, 2% girdle and a very deep pavilion.
B. A 20% crown, 4% girdle and a very fl at pavilion.
C. Either of the above.
12.07
#1 What characteristic would allow two diamonds, with
identical crowns, to have the exact same overall depth? #1
diamond with very steep pavilion angles, and #2 diamond
with ideal pavilion angles.
A. Nothing. It’s not possible.
B. A very thick girdle on #2 diamond.
C. A very large culet on #1 diamond.
D. A very small table on #2 diamond.
E. B & C
F. C & D
#2 If two diamonds had matching diameters and both with
66% depths, which would likely be more brilliant? #1 with
ideal pavilion angles and a very thick girdle. #2 with very
steep pavilion angles and a medium girdle.
A. Neither, because the scenario is not possible.
B. #1
C. #2
12.08
#1 Which of the following described diamonds of the same
color and clarity would be more likely to be of higher value?
A. 0.92 Round Brilliant; 54% table; 61.4 depth;
Thin to Medium Girdle; Very Good Polish; Good
Symmetry; Faint Fluorescence
B. 0.98 Round Brilliant; 64% table; 56.8 depth; Thin
to Thick Girdle; Good Polish; Good Symmetry; No
Fluorescence
Section13
13.01
#1 Grading clarity in a mounted diamond is consistently as
accurate as grading a loose diamond with a few years of
experience.
A. True
B. False
13.02
#1 Differentiating prong reflections from inclusions is easily
accomplished by…
A. tilting the mounting.
B. looking through the bottom of the diamond.
C. neither.
13.03
#1 Good reasons for covering inclusions with prongs or
bezels are…
A. protection from damage.
B. aesthetic appearance.
C. to defraud the next buyer.
D. none of the above.
E. A & B
F. B & C
#2 When clarity grading a mounted diamond the dark fi eld
illumination is almost useless.
A. True
B. False
13.04
Dark-Field Illumination (13.04)
#1 Dark-filed illumination for diamond clarity grading generally used for clarity grading in...
A. loose diamonds.
B. mounted diamonds.
C. neither, it is for color grading.
13.05
#1 It is always possible to locate hidden inclusions under
the prongs by viewing at several diff erent angles.
A. True
B. False
13.06
#1 The most effective method of making a fair off er on a
mounted diamond is to…
A. make the off er as low as possible to protect
yourself.
B. make a contingent off er based on a view of the
diamond after it is taken out of mounting.
C. deduct 50% of the original seller’s appraised value.
#2 If it is agreed that a diamond can be removed from the
mounting before a transaction occurs, always decide...
A. the responsible party of remounting if a transaction
does not take place.
B. the responsibility of replacing a worn head that has
been unavoidably damaged if a transaction does
not take place.
C. what the selling price will be based on represented
accuracy.
D. all of the above.- 154
Section 14
14.01
#1 Grading color is generally an easier task than clarity
grading in a mounting.
A. True
B. False
#2 In order to hide the color of an L-M graded diamond it
would be advisable to mount it in…
14.02
#1 Anyone should easily accomplish a 95% accuracy rate
of grading color in a mounting.
A. True
B. False
14.03
#1 The very first task in grading a mounted diamond is…
A. checking the diameter.
B. cleaning it.
C. checking for fracture filling.
14.04
#1 The most eff ective metal (without plating) to have to
grade color in is…
A. platinum.
B. yellow gold.
C. white gold.
#2 It is always helpful to attempt a view through the
pavilion of a mounted diamond for the purposes of color
grading.
A. True
B. False
14.05
#1 Master stones are a waste of time unless the subject
diamond is loose.
A. True
B. False
14.06
#1 The general rule of thumb is to mount colorless and
near colorless diamonds in…
A. 14K/18K yellow gold.
B. white gold/platinum.
C. neither of the above.
A. 14K/18K yellow gold.
B. white gold/platinum.
C. neither of the above.
14.07
#1 The most effective method of detecting the presence of
fluorescence is to view the diamond…
A. under 30x magnification.
B. under long wave ultraviolet light.
C. in direct sunlight.
D. short wave ultraviolet light.
E. none of the above.
#2 The presence of strong blue fluorescence could detract
yellow from an “E” color diamond.
A. True
B. False
#3 The presence of strong blue fl uorescence could give
the illusion of making a “K” color look like an “H” color in the
face-up position.
A. True
B. False
14.08
#1 The safest approach in buying a mounted diamond is to
always make the offer…
A. after using dark-field illumination.
B. contingent based on accurate representation.
C. after the diamond has been soaked in alcohol.
Remember this is part of the learning process so if your percentage was
disappointing simply reread the sections that you are having difficulty with. After rereading the section and you still do not understand the material, make a note of it below for follow-up at the end of the course.