Study Questions for Sections 10 & 11
Instructions: Finish answering all the questions before proceeding to the next section. Please do not peek at the answers in the back of your course until you have completed the study test for these sections. Simply circle the correct response letter in these multiple choice questions.
Section 10
10.02
#1 In buying a mounted diamond the risk of inaccurate grading is greater than it would be for a loose diamond.
A. True
B. False
10.03
#1 A 6.7 mm round brilliant cut diamond will always weigh more than 1.00 carat.
A. True
B. False
10.04
#1 Always assume a private party seller has intentionally deceived you when a mounted diamond has a chip that was hidden under a prong.
A. True
B. False
10.05
#1 Which of the following scenarios could most likely allow a 6.7 mm diameter round brilliant cut diamond to weigh less than 0.90 carat?
A. A 64% table with a 60.2% depth.
B. A 64% table with 39.5 degree pavilion angles and a 59.5% depth.
C. A 64% table with 32.5 degree pavilion angles and a 10% crown.
#2 Which of the following characteristics would be the most obvious in identifying a very flat pavilion?
A. The “Table Reflection Method” displaying a reflection 1/3 of the way to the table edge.
B. A girdle reflection inside the table.
C. A darkness in the center of the diamond.
10.06
#1 A diamond mounted in yellow gold could make a “K” color appear whiter.
A. True
B. False
10.07
#1 Which of the following set of characteristics would most likely give the illusion of a “K” color having the appearance of an “H” color?
A. Faint blue fluorescence mounted in platinum.
B. Strong blue fluorescence loose on a grading tray.
C. Strong blue fluorescence mounted in yellow gold prongs.
10.08
#1 Which method would be the most decisive in detecting blue fluorescence?
A. Exposing it to long wave ultraviolet light.
B. Exposing it to short wave ultraviolet light.
C. Exposing it to indirect sunlight.
#2 Strong blue fluorescence could potentially raise the value of a diamond in lower colors.
A. True
B. False
# 3 The safest approach in making an offer on a diamond is to…
A. make it very low.
B. do it contingent upon the presumed grade until it has been removed from the mounting.
C. demand your money back if you are disappointed in the grade and weight.
Section 11
11.01
#1 It is never possible to get a close weight estimation in a mounted diamond.
A. True
B. False
11.02
#1 What is the increment and system of measurement used in the diamond trade?
A. Fractions of an inch.
B. Millimeters in the metric system.
C. Centimeters in the metric system.
11.03
#1 A diamond that has a diameter of 7.23 means…
A. 23/100ths of a centimeter over 7 centimeters.
B. 23/100ths of a millimeter over 7 millimeters.
C. 23/10ths of a millimeter over 7 millimeters.
#2 Which of the following descriptions is the closest to six and a half millimeters?
A. 6.21
B. 6.05
C. 6.005
11.04
#1 A hole gauge is the most accurate method of estimating diamond weight.
A. True
B. False
#2 Diamond sieves are used to…
A. estimate melee weight.
B. sort melee into size categories.
C. estimate any size diamond.
11.06
#1 A 0.46 ct. diamond would most commonly be expressed as…
A. a light half.
B. a half.
C. three-eighths.
D. none of the above.
#2 A 0.85 ct. diamond would most commonly be expressed as…
A. an eighty-five carater.
B. an eighty-five pointer.
C. a light carat.
#3 The least common expression of a 1.65 ct. diamond is…
A. a carat sixty-five.
B. one-point-six-five.
C. a hundred and sixty-five points.
#4 A 0.75 ct. diamond could also be referred to as a three-grainer.
A. True
B. False
11.07
#1 A major reason for the necessity of weight estimation formulas is the fact that diamonds are…
A. inconsistent in proportions.
B. inconsistent in specific gravity.
C. consistent in angles.
11.08
#1 In adjusting a formula for girdle thickness which of the following would not apply?
A. Thin Girdle
B. Medium Girdle
C. Thick Girdle
#2 Generally the thicker the girdle the more the diamond will weigh, given the same diameter.
A. True
B. False
#3 A girdle that is “Thin to Slightly Thick” could potentially be an average of…
A. medium.
B. thick.
C. very thick.
#4 It is unusual to find thick girdles on fancy shapes.
A. True
B. False
#5 If a 0.20 ct. diamond and a 1.20 ct. diamond were both described as having an average girdle of “thick” the “Girdle Thickness Adjustment” operator would be the same.
A. True
B. False
11.09
#1 Averaging a girdle thickness for the purposes of the “Girdle Thickness Adjustment” operator is somewhat of a judgment call.
A. True
B. False
#2 Which of the following “Medium to Thick” diamond girdles would need the largest adjustment in the GTA operator?
A. 50% medium, 50% thick
B. 25% medium, 75% thick
C. 10% medium, 90% thick
11.10
#1 Dealers who are too conservative in their weight estimates may at times look…
A. like smart businessmen.
B. dishonest.
C. unprofessional.
D. B & C.
E. all of the above.
11.11
#1 The oval weight estimation formula is as follows…
A. average diameter x average diameter x depth x .0062
B. average diameter x average diameter x depth x .0061
C. widest diameter x narrowest diameter x depth x .0062
#2 With your calculator formulate the weight for the following described round brilliant diamond:
Narrowest diameter: 6.04
Widest diameter: 6.17
Depth: 4.01
Medium Girdle
A. 0.85 ct.
B. 0.91 ct.
C. 0.99 ct.
#3 With your calculator formulate the weight for the following described round brilliant diamond:
Narrowest diameter: 5.32
Widest diameter: 5.41
Depth: 2.87
Thick Girdle GTA: 1.03
A. 0.45 ct.
B. 0.48 ct.
C. 0.52 ct.
#4 With your calculator formulate the weight for the following described round brilliant diamond:
Narrowest diameter: 8.31
Widest diameter: 8.49
Depth: 5.76
Extremely Thin Girdle GTA: 0.95
A. 2.35 ct.
B. 2.44 ct.
C. 2.56 ct.
#5 If the results of a weight estimation formula was 0.568 it would be expressed as…
A. 0.56 ct.
B. 0.57 ct.
C. 0.58 ct.
#6 If the results of a weight estimation formula was 0.999 it would be expressed as…
A. 0.99 ct.
B. 0.999 ct.
C. 1.00 ct.
#7 If the results of a weight estimation formula was 1.235 it would be expressed as…
A. 1.23 ct.
B. 1.24 ct.
C. 1.25 ct.
11.12
#1 One difficulty of measuring a marquis or pear shape for weight estimation in a mounting is compensating for pronged end(s).
A. True
B. False
11.13
#1 In addition to the GTA (Girdle Thickness Adjustment) which of the following characteristics in a pear shape diamond would need to be considered?
A. A Very Thick Girdle.
B. High shoulders.
C. A small table.
#2 In addition to the GTA (Girdle Thickness Adjustment) which of the following characteristics in an emerald cut diamond would need to be considered?
A. An extremely thin girdle.
B. Crown angles over 35 degrees.
C. A pronounced pavilion bulge.
11.14
#1 The width is not always expressed as “1” in a Length to Width Ratio.
A. True
B. False
#2 Given the following measurements of an emerald cut diamond what would the correct Length to Width Ratio be?
Length: 8.23 mm
Width: 6.78 mm
Depth: 4.85 mm
A. 1.25 to 1 L/W
B. 1.21 to 1 L/W
C. 1.18 to 1 L/W
#3 Given the following measurements of a marquis cut diamond what would the correct Length to Width Ratio be?
Length:11.36mm
Width: 5.76 mm
Depth: 3.25 mm
A. 2.11 to 1 L/W
B. 2.00 to 1 L/W
C. 1.97 to 1 L/W
11.15
#1 Given the following measurements of a marquis cut diamond what is the correct weight estimation?
Length: 9.03 mm
Width: 5.21 mm
Depth: 3.87 mm
Girdle Very Thick-: GTA 1.05
Please refer to the table below:
L/W ratio LWA
1.50/1.00 .00565
1.75/1.00 .00570
2.00/1.00 .00580
2.25/1.00 .00583
2.50/1.00 .00585
2.75/1.00 .00590
3.00/1.00 .00595
A. 1.09 ct.
B. 1.12 ct.
C. 1.15 ct.
11.16
#1 Given the following measurements of an emerald cut diamond what is the correct weight estimation?
Length: 7.52 mm
Width: 5.05 mm
Depth: 3.81 mm
Girdle Very Thick-: GTA 1.05
Please refer to the following table:
L/W ratio LWA
1.00/1.00 .0080
1.50/1.00 .0092
1.75/1.00 .0097
2.00/1.00 .0100
2.25/1.00 .0104
2.50/1.00 .0106
A. 1.25 ct.
B. 1.35 ct.
C. 1.39 ct.
11.18
#1 Given the following measurements of a pear shape diamond what is the correct weight estimation?
Length: 5.45 mm
Width: 4.34 mm
Depth: 3.06 mm
Girdle Very Thick-: GTA 1.05
Please refer to the table below:
L/W Ratio LWA
1.25/1.00 .00615
1.50/1.00 .00600
1.66/1.00 .00590
2.00/1.00 .00575
A. 0.40 ct.
B. 0.46 ct.
C. 0.51 ct.
11.19
#1 Given the following measurements of an oval shape diamond what is the correct weight estimation?
Length:11.05 mm
Width: 8.76mm
Depth: 5.85 mm
Girdle Very Thick-: GTA 1.035
Additional Adjustment for Cushion Shape: 1.03
A. 2.48 ct.
B. 3.03 ct.
C. 3.79 ct.
11.20
#1 Given the following measurements of a heart shape diamond what is the correct weight estimation?
Length: 10.55 mm
Width: 9.98 mm
Depth: 4.85 mm
Girdle Very Thick-: GTA 1.035
A. 3.11 ct.
B. 3.21 ct.
C. 3.31 ct.
11.21
#1 Given the following measurements of a triangular brilliant diamond what is the correct weight estimation?
Length: 4.21mm
Width: 4.05 mm
Depth: 2.87 mm
Girdle Thick: GTA 1.04
A. 0.25 ct.
B. 0.29 ct.
C. 0.33 ct.
