Study Questions for Section 8 & 9

Study Questions for Section 8 & 9

Instructions: Finish answering all the questions before proceeding to the next section. Simply circle the correct response letter in these multiple choice questions.

Section 8


#1 The terms “synthetic” and “imitation” have identical meanings.

A. True
B. False

#2 Synthetic diamond retains the same properties as natural diamond.

A. True
B. False


#1 Gem quality synthetic diamond was first produced by ______ in 1970.

A. DeBeers
C. the Soviet Union


#1 In more recent advances there has been relative success in creating synthetic, colored diamonds including intense blue.

A. True
B. False


#1 Synthetic diamond identification may include the location of…

A. metallic inclusions.
B. color zoning in blues.
C. electrical conductivity in blues.
D. all of the above.

#2 In synthetics cross-shaped patterns may occur under…

A. grading light.
B. shortwave ultraviolet.
C. either of the above.

#3 Color zoning is common in natural diamond.

A. True
B. False


#1 At this writing (2003), synthetic diamonds are commonplace on the market.

A. True
B. False


#1 Natural moissanite was discovered by Henri Moissan….

A. on an expedition in West Africa.
B. in a laboratory experiment.
C. inside a Canyon Diablo meteorite.

#2 Synthetic moissanite is the same as…

A. corundum.
B. silicon carbide.
C. synthetic diamond.

#3 Moissanite, like CZ, is much heavier than diamond.

A. True
B. False

#4 Moissanite is approximately ______ times the weight of diamond.

A. 2.1
B. 1.61
C. 0.91

#5 Moissanite can be identified by its…

A. needle like inclusions (when present).
B. elongated feathers (when present).
C. hexagonal crystals (when present).
D. none of the above.

#6 Moissanite will generally have polishing lines that all run in the same direction.

A. True
B. False

#7 Moissanite can be identified reliably by searching for a culet doubling effect through the crown main due to double refraction.

A. True
B. False

#8 Moissanite can be compared to the E-F colors on the diamond color scale consistently.

A. True
B. False

#9 Moissanite’s facets are as sharp as diamond’s due to its hardness.

A. True
B. False

#10 Electronic moissanite testers are 100% reliable.

A. True
B. False

#11 Using the Relative Mohs Hardness Scale, Moissanite is rated…

A. 9
B. 9.25
C. 9.5


#1 Cubic zirconia ______ on the hardness scale.

A. is 8.5 to 9
B. is 8 to 8.5
C. is 7.5 to 8
D. varies

#2 Cubic zirconia’s fracture is ______ which is______.

A. conchoidal/smooth.
B. uneven/jagged.
C. neither of the above.

#3 A loose CZ is easily determined to be non-diamond by its weight, which is ______ times heavier than diamond.

A. 0.91
B. 1.3 to 1.42
C. 1.56 to 1.7

#4 An obvious clue of CZ identification is….

A. needle like inclusions.
B. severe scratches and nicks on the crown after a period of wear.
C. higher refractive index compared to diamond.

#5 Identification of CZ could include…

A. polishing lines that all run in the same direction.
B. rounded facet edges.
C. the lack of natural inclusions.
D. all of the above.

#6 CZ is doubly refractive.

A. True
B. False

Section 9


#1 The acid bath will remove ______ particles lodged in a bruted girdle, whereas no other diamond cleaning methods will.

A. dried oil
B. metal
C. organic
D. all of the above


#1 If employing the acid bath cleaning method it is imperative that the process be…

A. completed with an exhaust system.
B. completed outside.
C. either of the above.


#1 In cleaning, after removing the diamonds from the acid you should first rinse them with…

A. solvent.
B. alcohol.
C. water.

#2 When steaming several diamonds in a strainer for the purpose of cleaning there is a risk of…

A. damage.
B. burning.
C. either of the above.


#1 In the acid bath cleaning method for more valuable diamonds it is recommended…

A. to keep five or less diamonds in the same beaker.
B. not to employ this method.
C. to boil one at a time.


#1 The last steps in the acid bath cleaning is…

A. water rinse and inventory number.
B. alcohol rinse and lint free cloth wipe.
C. steam and lint free cloth wipe.


#1 It is recommended if steaming a more valuable diamond that it be…

A. accomplished without using extremely hot water.
B. accomplished individually.
C. accomplished in a strainer with two other diamonds.


#1 After a diamond is cleaned in the acid bath it should not be …

A. wiped with a lint free cloth.
B. handled directly with fingers.
C. steamed again.


#1 A quick and easy method of cleaning a heavily soiled diamond is with the use of…

A. alcohol.
B. steam.
C. salt.


#1 Before steaming a mounted diamond that is heavily soiled it should first be…

A. cleaned in the ultrasonic.
B. acid boiled.
C. soaked in alcohol.

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