DIAMOND AND DIAMOND GRADING
TEST WITH QUESTIONS AND
ANSWERS
Abrasiong(Abr)g-gcorrectganswer-
Agseriesgofgminutegnicksgalonggthegfacetgjunctionsgofgagfashionedgdiamond;ggivesgth
egedgesgagwhitegorgfuzzygappearance.g(Assignmentg10)
Adamantineglusterg-gcorrectganswer-
Theghighestgdegreegofglustergpossiblegingagtransparentgmaterial.g(Assignmentg8)
Aggregateg-gcorrectganswer-
Agsolidgmassgofgindividual,grandomlygorientedgcrystals,gintergrowngorgheldgtogetherg
bygagnaturalgbindinggagent.g(Assignmentg7)
Alluvialgdepositg-gcorrectganswer-
Agdepositgwhereggemsgaregerodedgfromgtheirgsourcegrock,gthengtransportedgawaygfr
omgthegsourcegandgfurthergconcentrated.g(Assignmentg5)
Anglegofgincidenceg-gcorrectganswer-
Theganglegatgwhichgagraygofglightgstrikesgagsurface,gmeasuredgfromgthegnormal.g(As
signmentg8)
Anglegofgreflectiong-gcorrectganswer-
Theganglegbetweengthegnormalgandgagreflectedgraygofglight.g(Assignmentg8)
Annealingg-gcorrectganswer-
Usinggheatgtogstabilizegirradiatedgcolorginggemstones.g(Assignmentg12)
,Appraisalg-gcorrectganswer-
Angestimationgofgthegvaluegofgangarticle,gusuallygforginsurancegpurposes.g(Assignme
ntg1)
Averageggirdlegdiameterg-gcorrectganswer-
Thegresultgachievedgbygaddinggthegsmallestgandglargestggirdlegmeasurementsgofgagr
oundgbrilliantgandgdividinggbygtwo.g(Assignmentg14)
Bastg-gcorrectganswer-Frostedgroughgdiamond.g"Bark"gingDutch.g(Assignmentg9)
BeardedgGirdleg(BG)g-gcorrectganswer-
Verygsmallgfeathersgthatgextendgfromgtheggirdlegsurfacegintogthegstone;gcangresultgfr
omgthegcuttinggprocess.g(Assignmentg10)
Bellyg-gcorrectganswer-
Thegslightlygcurvinggcentergofgtheglonggsidegofgagpear,gmarquise,gheart,gorgoval.g(As
signmentg16)
Beneficiationg-gcorrectganswer-
Agcommitmentgtogreservegagportiongofgthegresourcesgderivedgfromganygcountrygforgt
hegeconomicgdevelopmentgofgthatgcountry.g(Assignmentg3)
BestgPracticesgPrinciplesg(BPP)g-gcorrectganswer-
DegBeers'gformalizedgcommitmentgofgitselfgandgitsgsightholdersgtogtheghighestgethic
algstandards.g(Assignmentg3)
Blemishg-gcorrectganswer-
Claritygcharacteristicgthat'sgconfinedgtogthegsurfacegofgagpolishedggemstone.g(Assign
mentg10)
Blockgcavingg-gcorrectganswer-
Undergroundgmininggthatginvolvesgbuildinggagconcrete-
linedgtunnelgundergangoregdeposit,gthengcollectinggthegoregthroughgopeningsgingthegl
iner.g(Assignmentg6)
Blockingg-gcorrectganswer-
Placinggthegfirstg17gorg18gfacetsgongagdiamond.g(Assignmentg9)
Bow-tieg-gcorrectganswer-
Agdarkgareagacrossgthegcentergofgangelongatedgbrilliantgcut.g(Assignmentg16)
Brick-and-mortargretailerg-gcorrectganswer-
Agtraditionalgstoregconsistinggofgwallsgandgagfixedglocation.g(Assignmentg3)
Brightnessg-gcorrectganswer-
Thegeffectgofgallgthegdiamond'sginternalgandgexternalgreflectionsgofgwhiteglight.g(Assi
gnmentg8)
, Brilliantgcutg-gcorrectganswer-Agcuttinggstylegingwhichgtriangulargandgkite-
shapedgfacetsgradiategfromgaggem'sgcentergtowardgitsggirdle.g(Assignmentg16)
Brillianteeringg-gcorrectganswer-
Placementgandgpolishinggofgthegstargandguppergandglowerggirdlegfacets.g(Assignme
ntg9)
Bruiseg(Br)g-gcorrectganswer-
Agtinygareagofgimpactgaccompaniedgbygverygsmall,groot-
likegfeathersgvisiblegatg10Xgmagnification;gtypicallygoccursgatgagfacetgjunction.g(Assi
gnmentg10)
Brutingg-gcorrectganswer-Forminggthegbasicgface-
upgoutlinegofgagdiamondgtogpreparegitgforgfaceting.g(Assignmentg9)
Bulkgsamplingg-gcorrectganswer-Large-scalegcharactergsampling.g(Assignmentg5)
BurngMarksg(Brn)g-gcorrectganswer-
Hazygsurfacegareasgthatgresultgfromgexcessivegheatgorgfromgunevengpolishinggcaus
edgbygstructuralgirregularities;galsogcalledgpolishgmarksgorgburnedgfacets.g(Assignme
ntg10)
Cavityg(Cv)g-gcorrectganswer-
Angangulargopeninggcreatedgwhengpartgofgagfeathergbreaksgaway.g(Assignmentg10)
CentralgSellinggOrganisationg(CSO)g-gcorrectganswer-
Angagencygdesignedgtogpurchase,gsort,gevaluate,gandgsellgroughgdiamonds.g(Assign
mentg2)
Charactergsamplingg-gcorrectganswer-
Testinggforgthegsize,gshape,gclarity,gandgcolorgofgthegdiamondsgingagdeposit.g(Assign
mentg5)
Characteristicgcolorg-gcorrectganswer-Thegbasicgcolorgofgagfancy-
coloredgdiamond.g(Assignmentg13)
Chemicalgvaporgdepositiong(CVD)g-gcorrectganswer-
Angindustrialgprocessgadaptedgtogallowggrowthgofgsyntheticgdiamondgfromgcarbon-
richggasgingthinglayersgontogagsilicongorgdiamondgsurface.g(Assignmentg19)
Chipg(Ch)g-gcorrectganswer-
Agshallowgopeninggcausedgbygdamagegtogthegstone'sgsurface;gtypicallygoccursgatgag
girdlegedge,gfacetgjunction,gorgculet.g(Assignmentg10)
Claritygcharacteristicg-gcorrectganswer-
Internalgorgexternalgfeaturegofgaggemstonegthatghelpsgdeterminegitsgqualitygandgesta
blishgitsgidentity.g(Assignmentg10)
TEST WITH QUESTIONS AND
ANSWERS
Abrasiong(Abr)g-gcorrectganswer-
Agseriesgofgminutegnicksgalonggthegfacetgjunctionsgofgagfashionedgdiamond;ggivesgth
egedgesgagwhitegorgfuzzygappearance.g(Assignmentg10)
Adamantineglusterg-gcorrectganswer-
Theghighestgdegreegofglustergpossiblegingagtransparentgmaterial.g(Assignmentg8)
Aggregateg-gcorrectganswer-
Agsolidgmassgofgindividual,grandomlygorientedgcrystals,gintergrowngorgheldgtogetherg
bygagnaturalgbindinggagent.g(Assignmentg7)
Alluvialgdepositg-gcorrectganswer-
Agdepositgwhereggemsgaregerodedgfromgtheirgsourcegrock,gthengtransportedgawaygfr
omgthegsourcegandgfurthergconcentrated.g(Assignmentg5)
Anglegofgincidenceg-gcorrectganswer-
Theganglegatgwhichgagraygofglightgstrikesgagsurface,gmeasuredgfromgthegnormal.g(As
signmentg8)
Anglegofgreflectiong-gcorrectganswer-
Theganglegbetweengthegnormalgandgagreflectedgraygofglight.g(Assignmentg8)
Annealingg-gcorrectganswer-
Usinggheatgtogstabilizegirradiatedgcolorginggemstones.g(Assignmentg12)
,Appraisalg-gcorrectganswer-
Angestimationgofgthegvaluegofgangarticle,gusuallygforginsurancegpurposes.g(Assignme
ntg1)
Averageggirdlegdiameterg-gcorrectganswer-
Thegresultgachievedgbygaddinggthegsmallestgandglargestggirdlegmeasurementsgofgagr
oundgbrilliantgandgdividinggbygtwo.g(Assignmentg14)
Bastg-gcorrectganswer-Frostedgroughgdiamond.g"Bark"gingDutch.g(Assignmentg9)
BeardedgGirdleg(BG)g-gcorrectganswer-
Verygsmallgfeathersgthatgextendgfromgtheggirdlegsurfacegintogthegstone;gcangresultgfr
omgthegcuttinggprocess.g(Assignmentg10)
Bellyg-gcorrectganswer-
Thegslightlygcurvinggcentergofgtheglonggsidegofgagpear,gmarquise,gheart,gorgoval.g(As
signmentg16)
Beneficiationg-gcorrectganswer-
Agcommitmentgtogreservegagportiongofgthegresourcesgderivedgfromganygcountrygforgt
hegeconomicgdevelopmentgofgthatgcountry.g(Assignmentg3)
BestgPracticesgPrinciplesg(BPP)g-gcorrectganswer-
DegBeers'gformalizedgcommitmentgofgitselfgandgitsgsightholdersgtogtheghighestgethic
algstandards.g(Assignmentg3)
Blemishg-gcorrectganswer-
Claritygcharacteristicgthat'sgconfinedgtogthegsurfacegofgagpolishedggemstone.g(Assign
mentg10)
Blockgcavingg-gcorrectganswer-
Undergroundgmininggthatginvolvesgbuildinggagconcrete-
linedgtunnelgundergangoregdeposit,gthengcollectinggthegoregthroughgopeningsgingthegl
iner.g(Assignmentg6)
Blockingg-gcorrectganswer-
Placinggthegfirstg17gorg18gfacetsgongagdiamond.g(Assignmentg9)
Bow-tieg-gcorrectganswer-
Agdarkgareagacrossgthegcentergofgangelongatedgbrilliantgcut.g(Assignmentg16)
Brick-and-mortargretailerg-gcorrectganswer-
Agtraditionalgstoregconsistinggofgwallsgandgagfixedglocation.g(Assignmentg3)
Brightnessg-gcorrectganswer-
Thegeffectgofgallgthegdiamond'sginternalgandgexternalgreflectionsgofgwhiteglight.g(Assi
gnmentg8)
, Brilliantgcutg-gcorrectganswer-Agcuttinggstylegingwhichgtriangulargandgkite-
shapedgfacetsgradiategfromgaggem'sgcentergtowardgitsggirdle.g(Assignmentg16)
Brillianteeringg-gcorrectganswer-
Placementgandgpolishinggofgthegstargandguppergandglowerggirdlegfacets.g(Assignme
ntg9)
Bruiseg(Br)g-gcorrectganswer-
Agtinygareagofgimpactgaccompaniedgbygverygsmall,groot-
likegfeathersgvisiblegatg10Xgmagnification;gtypicallygoccursgatgagfacetgjunction.g(Assi
gnmentg10)
Brutingg-gcorrectganswer-Forminggthegbasicgface-
upgoutlinegofgagdiamondgtogpreparegitgforgfaceting.g(Assignmentg9)
Bulkgsamplingg-gcorrectganswer-Large-scalegcharactergsampling.g(Assignmentg5)
BurngMarksg(Brn)g-gcorrectganswer-
Hazygsurfacegareasgthatgresultgfromgexcessivegheatgorgfromgunevengpolishinggcaus
edgbygstructuralgirregularities;galsogcalledgpolishgmarksgorgburnedgfacets.g(Assignme
ntg10)
Cavityg(Cv)g-gcorrectganswer-
Angangulargopeninggcreatedgwhengpartgofgagfeathergbreaksgaway.g(Assignmentg10)
CentralgSellinggOrganisationg(CSO)g-gcorrectganswer-
Angagencygdesignedgtogpurchase,gsort,gevaluate,gandgsellgroughgdiamonds.g(Assign
mentg2)
Charactergsamplingg-gcorrectganswer-
Testinggforgthegsize,gshape,gclarity,gandgcolorgofgthegdiamondsgingagdeposit.g(Assign
mentg5)
Characteristicgcolorg-gcorrectganswer-Thegbasicgcolorgofgagfancy-
coloredgdiamond.g(Assignmentg13)
Chemicalgvaporgdepositiong(CVD)g-gcorrectganswer-
Angindustrialgprocessgadaptedgtogallowggrowthgofgsyntheticgdiamondgfromgcarbon-
richggasgingthinglayersgontogagsilicongorgdiamondgsurface.g(Assignmentg19)
Chipg(Ch)g-gcorrectganswer-
Agshallowgopeninggcausedgbygdamagegtogthegstone'sgsurface;gtypicallygoccursgatgag
girdlegedge,gfacetgjunction,gorgculet.g(Assignmentg10)
Claritygcharacteristicg-gcorrectganswer-
Internalgorgexternalgfeaturegofgaggemstonegthatghelpsgdeterminegitsgqualitygandgesta
blishgitsgidentity.g(Assignmentg10)
