GIA COLORED STONES EXAM QUESTIONS AND COR
Mineral c- cCORRECT cANS✔✔A cnatural, cinorganic csubstance cwith ca ccharacteristic cchemical cco
ccharacteristic cstructure.
Mixed ccut c- cCORRECT cANS✔✔A ccutting cstyle cthat ccombines cbrilliant-cut cand cstep ccut cfacets
Abrasions c- cCORRECT cANS✔✔Tiny cnicks cand cpits ccaused cby cwear cand cdamage cto ca cgem's
Absorption cspectrum c- cCORRECT cANS✔✔A cpattern cof cdark cvertical clines cor cbands cshown cby
cthrough ca cspectroscope.
Adularescence c- cCORRECT cANS✔✔The ccloudy cbluish cwhite clight cin ca cmoonstone, ccaused cb
Agate c- cCORRECT cANS✔✔Chalcedony cwith ca ccurved cor cangular cbands cor clayers cthat cdiffer
Aggregate c- cCORRECT cANS✔✔A cmass cof ctiny, crandomly coriented ccrystals.
Akoya c- cCORRECT cANS✔✔Common cname cfor cthe cPinctada cfucata coyster cand cthe cnatural co
Allochromatic c- cCORRECT cANS✔✔A cgem ccolored cby ctrace celements cin cits ccrystal cstructure.
Alluvial cdeposit c- cCORRECT cANS✔✔A cdeposit cwhere cgems care ceroded cfrom ctheir csource cro
cfrom ctheir csource cand cfurther cconcentrated.
Amorphous c- cCORRECT cANS✔✔Lacking ca cregular ccrystal cstructure.
Aragonite c- cCORRECT cANS✔✔A ccrystalized cform cof ccalcium ccarbonate cfound cin cnacre.
Assembled cstone c- cCORRECT cANS✔✔Two cor cmore cseparate cpieces cof cmaterial cjoined cto cfo
Asterism c- cCORRECT cANS✔✔Crossing cof cchatoyant cbands, ccreating ca cstar cin cthe cdome cof c
Atom c- cCORRECT cANS✔✔The cbasic cstructural cunit cof call cmatter.
Aventurescence c- cCORRECT cANS✔✔A cglittery ceffect ccaused cby clight creflecting cfrom csmall, cfl
cgemstone.
Background ccolor c- cCORRECT cANS✔✔An copal's cbodycolor, cindependent cof cits cplay-of-color.
,Brilliant ccut c- cCORRECT cANS✔✔Cutting cstyle cwith ctriangular cor ckite-shaped cfacets cthat cradia
cgirdle.
Cabochon c- cCORRECT cANS✔✔A csmoothly crounded cpolished cgem cwith ca cdomed ctop cand ca c
Calcareous cconcretion c- cCORRECT cANS✔✔A cnon-nacreous cnatural c"pearl".
Calibrated csizes c- cCORRECT cANS✔✔Gemstone csizes ccut cto cfit cstandard cmountings.
Cameo c- cCORRECT cANS✔✔A cgem ccarving cstyle cin cwhich cthe cdesign coften ca cwomen's cprofi
cor ccurved csurface.
Cavity c- cCORRECT cANS✔✔An copening cthat cextends cinto ca cgem cfrom cthe csurface.
Centipedes c- cCORRECT cANS✔✔Tiny ctension ccracks cin ca cmoonstone cthat cinterfere cwith cadul
Ceramic cprocess c- cCORRECT cANS✔✔A cprocess cin cwhich cground cpowder cis cheated, csometim
cproduce ca cfine-grained csolid cmaterial.
Certificate cof corigin c- cCORRECT cANS✔✔A cdocument cthat cindicates ca cstone's cgeographic corig
cand ctrace celement cchemistry.
Chalcedony c- cCORRECT cANS✔✔A ccryptocrystalline cquartz caggregate.
Charge ctransfer c- cCORRECT cANS✔✔A cprocess cwhere cthe celectrons cthat cselectively cabsorb c
cforth cbetween cneighboring cimpurity cions.
Chatoyancy c- cCORRECT cANS✔✔Bands cof clight cin ccertain cgems, ccaused cby creflection cof cligh
like cinclusions cor chollow ctubes.
Chemical ccomposition c- cCORRECT cANS✔✔Kinds cand crelative cquantities cof catoms cthat cmake
Chemical celement c- cCORRECT cANS✔✔A csubstance cthat cconsists cof catoms cof conly cone ckind
Chip c- cCORRECT cANS✔✔A cdamaged carea con ca cgem, cusually cnear cthe cgirdle.
Chrome ctourmaline c- cCORRECT cANS✔✔Trade cterm cfor ca cvibrant cgreen ctourmaline cthat's ccol
cchromium, cor cboth.
Circled cpearl c- cCORRECT cANS✔✔A cpearl cwith cone cor cmore cgrooved cor cridged crings call cthe
Cleavage c- cCORRECT cANS✔✔A csmooth, cflat cbreak cin ca cgemstone cparallel cto cplanes cof catom
cweak cor cfewer cbonds cbetween catoms cor cboth.
Cloud c- cCORRECT cANS✔✔Any chazy cor cmilky carea cthat ccannot cbe cdescribed cas ca cfeather, cf
cincluded ccrystals cor cneedles.
Cobbing c- cCORRECT cANS✔✔Removing cheavily cincluded csections cfrom ca cgemstone crough cby
csmall chammer.
Color ccenter c- cCORRECT cANS✔✔A csmall cdefect cin cthe catomic cstructure cof ca cmaterial cthat ca
ccolor.
Color cChange c- cCORRECT cANS✔✔A cdistinct cchange cin cgem ccolor cunder cdifferent ctypes cof cl
, Core c- cCORRECT cANS✔✔The cearth's cinnermost clayer.
Crazing c- cCORRECT cANS✔✔The cnetwork cof ctiny cfractures cthat cdevelop cwhen copal closes cmo
Crown c- cCORRECT cANS✔✔Top cpart cof cthe cgem cabove cthe cgirdle.
Crown-height cto cpavilion-depth cratio c- cCORRECT cANS✔✔The crelationship cof cthe cheight cof ca c
cits cpavilion, cjudged cby cviewing cits cprofile,
Crust c- cCORRECT cANS✔✔The csurface cand coutermost clater cof cthe cearth.
Cryptocystalline c- cCORRECT cANS✔✔An caggregate cmade cup cof cindividual ccrystals cdetectable
cmagnification.
Crystal cstructure c- cCORRECT cANS✔✔Regular, crepeating cinternal carrangement cof catoms cin ca
Cultured cblister cpearl c- cCORRECT cANS✔✔A ccultured cpearl cgrown caround ca cnucleus cglued cu
ca cmollusk's cshell.
Cultured cpearl c- cCORRECT cANS✔✔A cpearl cformed cas cthe cresult cof chuman cintervention cin cth
Custom-made cjewelry c- cCORRECT cANS✔✔A cunique cpiece cdesigned cand ccreated cfor ca cpartic
cspecially cchosen cstones.
Cut c- cCORRECT cANS✔✔A cgem cdealer's cterm cfor ca crandom csample cfrom ca cparcel cof cgemst
cthe cparcel's coverall cquality.
Cutter c- cCORRECT cANS✔✔A cmanufacturer cwho cproduces cfaceted cstones, ccabochons, cor ccar
Cutting ccenter c- cCORRECT cANS✔✔A ccity, cregion, cor ccountry cwith ca clarge cnumber cof cgemsto
Density c- cCORRECT cANS✔✔How cheavy can cobject cis cin crelation cto cits csize.
Designer ccuts c- cCORRECT cANS✔✔Artistic cgem ccuts cthat caren't climited cto cspecific cproportions
Dhun c- cCORRECT cANS✔✔Smoky ccorundum cthat cturns cblue cwhen ctreated.
Diffraction c- cCORRECT cANS✔✔A cspecial ckind cof cinterference cphenomenon cthat cbreaks cup cw
Disclosure c- cCORRECT cANS✔✔Clearly cand caccurately cinforming ccustomer cabout cthe cnature c
Dopstick c- cCORRECT cANS✔✔Wooden cor cmetal cstick cthat cholds cthe cpreform cduring cfaceting.
Double crefraction c- cCORRECT cANS✔✔When ca cgem's ccrystal cstructure csplits clight cinto ctwo cra
cslightly cdifferent cspeed cand cdirection.
Doublet c- cCORRECT cANS✔✔Two cseparate cpieces cof cmaterial cfused coe ccemented ctogether ct
cstone.
Durability c- cCORRECT cANS✔✔A cgemstone's cability cto cwithstand cwear, cheat, cand cchemicals.
Dyeing c- cCORRECT cANS✔✔A ctreatment cthat cadds ccolor cor caffects ccolor cby cdeepening cit, cm
cchanging cit.
Eluvial cdeposit c- cCORRECT cANS✔✔A cdeposit cwhere cgems care ceroded cfrom cthe csource crock
Mineral c- cCORRECT cANS✔✔A cnatural, cinorganic csubstance cwith ca ccharacteristic cchemical cco
ccharacteristic cstructure.
Mixed ccut c- cCORRECT cANS✔✔A ccutting cstyle cthat ccombines cbrilliant-cut cand cstep ccut cfacets
Abrasions c- cCORRECT cANS✔✔Tiny cnicks cand cpits ccaused cby cwear cand cdamage cto ca cgem's
Absorption cspectrum c- cCORRECT cANS✔✔A cpattern cof cdark cvertical clines cor cbands cshown cby
cthrough ca cspectroscope.
Adularescence c- cCORRECT cANS✔✔The ccloudy cbluish cwhite clight cin ca cmoonstone, ccaused cb
Agate c- cCORRECT cANS✔✔Chalcedony cwith ca ccurved cor cangular cbands cor clayers cthat cdiffer
Aggregate c- cCORRECT cANS✔✔A cmass cof ctiny, crandomly coriented ccrystals.
Akoya c- cCORRECT cANS✔✔Common cname cfor cthe cPinctada cfucata coyster cand cthe cnatural co
Allochromatic c- cCORRECT cANS✔✔A cgem ccolored cby ctrace celements cin cits ccrystal cstructure.
Alluvial cdeposit c- cCORRECT cANS✔✔A cdeposit cwhere cgems care ceroded cfrom ctheir csource cro
cfrom ctheir csource cand cfurther cconcentrated.
Amorphous c- cCORRECT cANS✔✔Lacking ca cregular ccrystal cstructure.
Aragonite c- cCORRECT cANS✔✔A ccrystalized cform cof ccalcium ccarbonate cfound cin cnacre.
Assembled cstone c- cCORRECT cANS✔✔Two cor cmore cseparate cpieces cof cmaterial cjoined cto cfo
Asterism c- cCORRECT cANS✔✔Crossing cof cchatoyant cbands, ccreating ca cstar cin cthe cdome cof c
Atom c- cCORRECT cANS✔✔The cbasic cstructural cunit cof call cmatter.
Aventurescence c- cCORRECT cANS✔✔A cglittery ceffect ccaused cby clight creflecting cfrom csmall, cfl
cgemstone.
Background ccolor c- cCORRECT cANS✔✔An copal's cbodycolor, cindependent cof cits cplay-of-color.
,Brilliant ccut c- cCORRECT cANS✔✔Cutting cstyle cwith ctriangular cor ckite-shaped cfacets cthat cradia
cgirdle.
Cabochon c- cCORRECT cANS✔✔A csmoothly crounded cpolished cgem cwith ca cdomed ctop cand ca c
Calcareous cconcretion c- cCORRECT cANS✔✔A cnon-nacreous cnatural c"pearl".
Calibrated csizes c- cCORRECT cANS✔✔Gemstone csizes ccut cto cfit cstandard cmountings.
Cameo c- cCORRECT cANS✔✔A cgem ccarving cstyle cin cwhich cthe cdesign coften ca cwomen's cprofi
cor ccurved csurface.
Cavity c- cCORRECT cANS✔✔An copening cthat cextends cinto ca cgem cfrom cthe csurface.
Centipedes c- cCORRECT cANS✔✔Tiny ctension ccracks cin ca cmoonstone cthat cinterfere cwith cadul
Ceramic cprocess c- cCORRECT cANS✔✔A cprocess cin cwhich cground cpowder cis cheated, csometim
cproduce ca cfine-grained csolid cmaterial.
Certificate cof corigin c- cCORRECT cANS✔✔A cdocument cthat cindicates ca cstone's cgeographic corig
cand ctrace celement cchemistry.
Chalcedony c- cCORRECT cANS✔✔A ccryptocrystalline cquartz caggregate.
Charge ctransfer c- cCORRECT cANS✔✔A cprocess cwhere cthe celectrons cthat cselectively cabsorb c
cforth cbetween cneighboring cimpurity cions.
Chatoyancy c- cCORRECT cANS✔✔Bands cof clight cin ccertain cgems, ccaused cby creflection cof cligh
like cinclusions cor chollow ctubes.
Chemical ccomposition c- cCORRECT cANS✔✔Kinds cand crelative cquantities cof catoms cthat cmake
Chemical celement c- cCORRECT cANS✔✔A csubstance cthat cconsists cof catoms cof conly cone ckind
Chip c- cCORRECT cANS✔✔A cdamaged carea con ca cgem, cusually cnear cthe cgirdle.
Chrome ctourmaline c- cCORRECT cANS✔✔Trade cterm cfor ca cvibrant cgreen ctourmaline cthat's ccol
cchromium, cor cboth.
Circled cpearl c- cCORRECT cANS✔✔A cpearl cwith cone cor cmore cgrooved cor cridged crings call cthe
Cleavage c- cCORRECT cANS✔✔A csmooth, cflat cbreak cin ca cgemstone cparallel cto cplanes cof catom
cweak cor cfewer cbonds cbetween catoms cor cboth.
Cloud c- cCORRECT cANS✔✔Any chazy cor cmilky carea cthat ccannot cbe cdescribed cas ca cfeather, cf
cincluded ccrystals cor cneedles.
Cobbing c- cCORRECT cANS✔✔Removing cheavily cincluded csections cfrom ca cgemstone crough cby
csmall chammer.
Color ccenter c- cCORRECT cANS✔✔A csmall cdefect cin cthe catomic cstructure cof ca cmaterial cthat ca
ccolor.
Color cChange c- cCORRECT cANS✔✔A cdistinct cchange cin cgem ccolor cunder cdifferent ctypes cof cl
, Core c- cCORRECT cANS✔✔The cearth's cinnermost clayer.
Crazing c- cCORRECT cANS✔✔The cnetwork cof ctiny cfractures cthat cdevelop cwhen copal closes cmo
Crown c- cCORRECT cANS✔✔Top cpart cof cthe cgem cabove cthe cgirdle.
Crown-height cto cpavilion-depth cratio c- cCORRECT cANS✔✔The crelationship cof cthe cheight cof ca c
cits cpavilion, cjudged cby cviewing cits cprofile,
Crust c- cCORRECT cANS✔✔The csurface cand coutermost clater cof cthe cearth.
Cryptocystalline c- cCORRECT cANS✔✔An caggregate cmade cup cof cindividual ccrystals cdetectable
cmagnification.
Crystal cstructure c- cCORRECT cANS✔✔Regular, crepeating cinternal carrangement cof catoms cin ca
Cultured cblister cpearl c- cCORRECT cANS✔✔A ccultured cpearl cgrown caround ca cnucleus cglued cu
ca cmollusk's cshell.
Cultured cpearl c- cCORRECT cANS✔✔A cpearl cformed cas cthe cresult cof chuman cintervention cin cth
Custom-made cjewelry c- cCORRECT cANS✔✔A cunique cpiece cdesigned cand ccreated cfor ca cpartic
cspecially cchosen cstones.
Cut c- cCORRECT cANS✔✔A cgem cdealer's cterm cfor ca crandom csample cfrom ca cparcel cof cgemst
cthe cparcel's coverall cquality.
Cutter c- cCORRECT cANS✔✔A cmanufacturer cwho cproduces cfaceted cstones, ccabochons, cor ccar
Cutting ccenter c- cCORRECT cANS✔✔A ccity, cregion, cor ccountry cwith ca clarge cnumber cof cgemsto
Density c- cCORRECT cANS✔✔How cheavy can cobject cis cin crelation cto cits csize.
Designer ccuts c- cCORRECT cANS✔✔Artistic cgem ccuts cthat caren't climited cto cspecific cproportions
Dhun c- cCORRECT cANS✔✔Smoky ccorundum cthat cturns cblue cwhen ctreated.
Diffraction c- cCORRECT cANS✔✔A cspecial ckind cof cinterference cphenomenon cthat cbreaks cup cw
Disclosure c- cCORRECT cANS✔✔Clearly cand caccurately cinforming ccustomer cabout cthe cnature c
Dopstick c- cCORRECT cANS✔✔Wooden cor cmetal cstick cthat cholds cthe cpreform cduring cfaceting.
Double crefraction c- cCORRECT cANS✔✔When ca cgem's ccrystal cstructure csplits clight cinto ctwo cra
cslightly cdifferent cspeed cand cdirection.
Doublet c- cCORRECT cANS✔✔Two cseparate cpieces cof cmaterial cfused coe ccemented ctogether ct
cstone.
Durability c- cCORRECT cANS✔✔A cgemstone's cability cto cwithstand cwear, cheat, cand cchemicals.
Dyeing c- cCORRECT cANS✔✔A ctreatment cthat cadds ccolor cor caffects ccolor cby cdeepening cit, cm
cchanging cit.
Eluvial cdeposit c- cCORRECT cANS✔✔A cdeposit cwhere cgems care ceroded cfrom cthe csource crock
