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Diamonds //&//diamond //grading//final
//exam //questions //with//answers //
Bourse //- //CORRECT //ANSWERS(S)✔✔A //diamond //buying //and //selling //club //
- //they //have //them //in //trading //centers Peridotite //- //CORRECT //ANSWERS(S)✔✔A //type //of //rock //that //diamonds //form //in //
- //igneous //rock //( //formed //from //a //molten //state)
- //most //diamond //form //in //this //rock //
- //has //consistent //release //of //carbon Eglogite //- //CORRECT //ANSWERS(S)✔✔A //type //of //rock //that //diamond //form //in //
- //metamorphic //rock //(rocks //that //have //been //altered //by //heat //and //pressure //
- //does //not //have //a //consistent //release //of //carbon How //far //beneath //the //earth //do //diamonds //form? //- //CORRECT //ANSWERS(S)✔✔ 90 - 140 //miles //( 140 - 220 //kilometers)
Drift //- //CORRECT //ANSWERS(S)✔✔A //horizontal //tunnel //drilled //through //a //diamond //pipe De //Beers //Consolidated //Mines //Ltd. //was //named //after //- //CORRECT //ANSWERS(S)✔✔the //owners //of //a //farm //where //one //of //the //first //diamond //rushes //took //place. The //Central //Selling //Organization //(CSO) //- //CORRECT //ANSWERS(S)✔✔A //rough //diamond //distribution //agency //
- //served //as //this //until // 2001 Pipes //- //CORRECT //ANSWERS(S)✔✔The //deep //vertical //formations //through //which //diamonds //travel //to //the //surface Chambering //- //CORRECT //ANSWERS(S)✔✔An //older //underground //mining //technique //
- //expensive //& //dangerous //so //no //longer //used //
- //block //caving //is //the //alternative //to //this Most //of //the //diamonds //that //come //from //Africa //are //recovered //from //- //CORRECT //ANSWERS(S)✔✔pipe, //alluvial, //and //marine //deposits
What //crystal //system //does //diamond //belong //to? //- //CORRECT //ANSWERS(S)✔✔Isometric //or //cubic //crystal //system What //are //diamond's // 3 //internal //crystal //planes? //- //CORRECT //ANSWERS(S)✔✔Cubic //( //runs //horizontal), //octahedral //(on //face), //dodecahedral //(runs //vertical) The //crystal //planes //most //suitable //for //cleaving //a //diamond //are //the //- //CORRECT //ANSWERS(S)✔✔octahedral //planes Another //name //for //the //cubic //system //is //- //CORRECT //ANSWERS(S)✔✔isometric Blocker //- //CORRECT //ANSWERS(S)✔✔Polishes //the //crown //and //pavilion //mains Brillianteering //- //CORRECT //ANSWERS(S)✔✔Polishing //of //the //star //& //upper //and //lower //half //facets Bezel //facets //are //the //ones //shaped //like //- //CORRECT //ANSWERS(S)✔✔kites
star //facets //are //the //ones //shaped //like //- //CORRECT //ANSWERS(S)✔✔triangles //next //to //table Upper //half //facets //are //the //ones //- //CORRECT //ANSWERS(S)✔✔on //the //outer //edge //next //to //the //girdle Visible //light //is //a //form //of //- //CORRECT //ANSWERS(S)✔✔radiant //energy Grease //on //the //pavilion //of //a //diamond //results //in //- //CORRECT //ANSWERS(S)✔✔more //light //leakage //through //the //pavillion The //rotary //saw //contributed //to //the //diamond //cutting //industry //by //- //CORRECT //ANSWERS(S)✔✔allowing //for //greater //weight //retention //from //rough A //surface //indentation //with //tiny, //root-like //feathers //penetrating //the //stone //is //called //a //- //CORRECT //ANSWERS(S)✔✔Bruise Inclusions //are //usually //most //visible //when //they're //located //- //CORRECT //ANSWERS(S)✔✔directly //under //the //table
cloud //- //CORRECT //ANSWERS(S)✔✔many //tightly //grouped //pinpoints a //twinning //wisp //- //CORRECT //ANSWERS(S)✔✔A //series //of //pinpoints, //clouds, //or //crystals //that //form //in //a //diamond's //growth //plane The // 5 //clarity //factors //- //CORRECT //ANSWERS(S)✔✔size, //number, //location, //relief, //nature requirements //for //a //flawless //diamond //- //CORRECT //ANSWERS(S)✔✔no //inclusions //or //blemishes //under // 10 x // can //have //these //features:
- //extra //facets //not //visible //face-up //
- //naturals //confined //to //the //girdle //as //long //as //they //don't //thicken //the //girdle //or //distort //its //outline //
- //internal //graining //that's //not //reflective, //white, //colored, //and //doesn't //affect //transparency //
- //inscriptions //that //don't //penetrate //the //surface Internally //Flawless //- //requirements //- //CORRECT //ANSWERS(S)✔✔no //inclusions, //only //insignificant //blemishes
VVS1 //& //VVS2 //- //requirements //together //and //separate //- //CORRECT //ANSWERS(S)✔✔contain //minute //inclusions //that //are //difficult //to //see //under //10x inclusions //are //extremely //difficult //to //see //face //up // VVS1- //pinpoint //or //2, //possibly //internal //graining //not //seen //face-up VVS2- //inclusions //are //very //difficult //to //see // surface-reaching //inclusions //possible VS1 //& //VS2 //- //CORRECT //ANSWERS(S)✔✔contain //minor //inclusions //that //range //from //difficult //(VS1) //or //somewhat //difficult //(VS2) //to //see //at //10x //
- //all //inclusions //are //possible, //grade //depends //on //overall //visibility SI1 //& //SI2 //- //CORRECT //ANSWERS(S)✔✔noticeable //inclusions //that //are //easy //(SI1) //or //very //easy //(SI2) //to //see //at //10x //
- //all //inclusions //are //possible, //grade //depends //on //visibility I1 //, //I2, //I3 //- //CORRECT //ANSWERS(S)✔✔inclusions //ae //obvious //at //10x //but //can //be //seen //without //magnification //
- //inclusions //seriously //affect //durability //
- //usually //used //for //industrial //purposes
Craftsmanship //- //CORRECT //ANSWERS(S)✔✔The //care //that //goes //into //the //fashioning //of //a //polished //diamond, //as //confirmed //by //its //finish Design //- //CORRECT //ANSWERS(S)✔✔A //diamond's //physical //shape, //including //its //proportions //and //durability, //determined //by //decisions //made //during //the //fashioning //process Finish //- //CORRECT //ANSWERS(S)✔✔The //quality //of //the //polish //and //precision //of //the //cut //of //a //fashioned //gemstone The //bowing //method //- //CORRECT //ANSWERS(S)✔✔uses //the //star //facets //to //estimate //table //%
- //star //facets //should //be //1/2 //of //the //way //from //table //edge //to //girdle
- //if //they //go //1/3 //of //the //way //- //causes //to //appear //to //bow //in //, //subtract //6% //from //estimate if //they //go //2/3 //of //the //way- //appears //to //bow //out //, //add //6% //to //estimate using //the //bowing //method, //if //the //lines //are //straight, //the //table //% //is //about //- //CORRECT //ANSWERS(S)✔✔60% Using //the //bowing //method, //if //the //lines //bow //in //noticeably, //the //table //% //is //about //- //CORRECT //ANSWERS(S)✔✔53%
Using //the //bowing //method, //if //the //lines //bow //in //slightly, //the //table //% //is //about //- //CORRECT //ANSWERS(S)✔✔58% using //the //bowing //method, //if //the //lines //bow //out //slightly, //the //table //% //is //about //- //CORRECT //ANSWERS(S)✔✔63% using //the //bowing //method, //if //the //lines //bow //out //noticeably, //the //table //% //is //about //- //CORRECT //ANSWERS(S)✔✔67% The //flash //method //- //CORRECT //ANSWERS(S)✔✔used //to //estimate //table //% //
- //simplest //& //quickest //method //but //need //experience //looking //at //lots //of //different //table //sizes //
- //small //flash, //table //% //is //less //than //60%
- //medium //flash, //table //% //is // 60 - 64%
- //large //flash, //table //% //is //65% //or //more The //ratio //method //- //CORRECT //ANSWERS(S)✔✔used //to //estimate //table //% //
- //imagine //a //line //from //girdle //to //star //facet //(line //A) //& //a //line //from //star //facet //to //center //of //stone //where //cult //is //(line //B)
- //compare //the //difference //in //distance //between //A //& //B //
what //are //the //methods //used //for //table //size/ //% //estimation? //- //CORRECT //ANSWERS(S)✔✔the //flash //method the //ratio //method // the //bowing //method what //are //the //methods //used //to //estimate //crown //angle? //- //CORRECT //ANSWERS(S)✔✔profile //method //( //looking //at //the //profile //and //estimating //the //angle) //and //face-up //method //(using //the //width //of //the //pavilion //mains //through //the //table) excellent //cut //grade's //corresponding //total //depth //% //is //- //CORRECT //ANSWERS(S)✔✔57.5-63% Very //good //cut //grade's //corresponding //total //depth //% //is //- //CORRECT //ANSWERS(S)✔✔ 56 - 64.5% Good //cut //grade's //corresponding //total //depth //% //is //- //CORRECT //ANSWERS(S)✔✔ 53 - 66.5% Fair //cut //grade's //corresponding //total //depth //% //is //- //CORRECT //ANSWERS(S)✔✔ 51 - 70.9%
Poor //cut //grade's //corresponding //total //depth //% //is //- //CORRECT //ANSWERS(S)✔✔less //than //51% //to //greater //than //70% Culet //size //should //be //considered //when //determining //- //CORRECT //ANSWERS(S)✔✔pavilion //depth //percentage As //a //diamond's //pavilion //gets //deeper, //its //table //reflection //becomes //- //CORRECT //ANSWERS(S)✔✔larger naturals //are //a //part //of //an //evaluation //of //proportion //symmetry. //true //or //false //- //CORRECT //ANSWERS(S)✔✔true In //round //brillants, //the //girdle //reflection //( //fisheye //effect) //becomes //visible //face-up //at //what //pavilion //depth? //- //CORRECT //ANSWERS(S)✔✔pavilions //shallower //than //38% what //are //the //parts //of //a //pear //shape? //- //CORRECT //ANSWERS(S)✔✔head, //shoulder, //belly, //wing, //point what //are //the //parts //of //a //marquise //- //CORRECT //ANSWERS(S)✔✔point, //belly, //wing, //point
which //has //a //higher //SG? //diamond //or //GGG //- //CORRECT //ANSWERS(S)✔✔GGG diamond //simulates //called //"paste" //are //- //CORRECT //ANSWERS(S)✔✔glass Strontium //titanate //- //CORRECT //ANSWERS(S)✔✔man-made //diamond //simulant //
- //singly //refractive
- //low //hardness //
- //more //dispersive //than //diamond Synthetic //rutile //- //CORRECT //ANSWERS(S)✔✔diamond //simulant //
- //more //dispersive //than //strontium //titanate //
- //low //hardness //
- //doubly //refractive //
- //no //longer //used The //easiest //way //to //separate //diamond //from //synthetic //cubic //zirconia //is //by //checking //for //- //CORRECT //ANSWERS(S)✔✔thermal //conductivity
the //easiest //way //to //separate //diamond //from //synthetic //moissanite //is //by //checking //for //- //CORRECT //ANSWERS(S)✔✔doubling On //an //emerald-cut //diamond, //very //narrow //corners //should //be //noted //under //- //CORRECT //ANSWERS(S)✔✔proportions, //shape- appeal //factor some //diamond //simulates //display //"see-though" //b/c //compared //to //diamond, //they //- //CORRECT //ANSWERS(S)✔✔have //much //larger //critical //angles diamond's //girdle //surface //is //usually //a //- //CORRECT //ANSWERS(S)✔✔waxy //to //granular //surface The //use //of //lab-grown //diamonds //in //jewelry //- //CORRECT //ANSWERS(S)✔✔is //limited //by //high //production //costs what //is //an //indication //of //the //HPHT //treatment? //- //CORRECT //ANSWERS(S)✔✔etched //or //frosted //naturals Linear //accelerator //& //what //is //it //used //for //- //CORRECT //ANSWERS(S)✔✔A //machine //used //to //accelerate //electrons //to //high //energy //along //a //straight //path
three //per //carat //or //thirds //range //from //- //CORRECT //ANSWERS(S)✔✔. 30 -. 37 ct 40 //pointers //range //from //- //CORRECT //ANSWERS(S)✔✔. 38 -. 45 ct two //per //carat //stones //range //from //- //CORRECT //ANSWERS(S)✔✔.46- .59ct light //halves //range //from //- //CORRECT //ANSWERS(S)✔✔. 46 -. 49 ct halves //or // 50 //pointers //range //from //- //CORRECT //ANSWERS(S)✔✔. 50 -. 59 ct per-carat //pricing //- //CORRECT //ANSWERS(S)✔✔the //price //of //a //gem //divided //by //its //carat //weight //
- //price /// //carat //eight //= //per //carat //price how //do //you //calculate //table //% //for //a //round //brilliant? //- //CORRECT //ANSWERS(S)✔✔table //% //= //(average //table //diameter /// //AGD) //x // 100
how //do //you //estimate //star //length //%? //round //to //the //nearest? //- //CORRECT //ANSWERS(S)✔✔use //the //distance //between //table //edge //and //girdle //at //100%
- //if //stars //reach //1/3 //of //the //way //= //35%
- //1/2 //of //the //way //= //50% //
- //2/3 //of //the //way //= //65% //
- //3/4 //of //the //way //75% //average //all // 8 //estimations //and //round //to //the //nearest //5% is //a //nick //a //blemish //or //an //inclusion? //- //CORRECT //ANSWERS(S)✔✔a //nick //is //a //blemish is //a //chip //a //blemish //or //inclusion? //- //CORRECT //ANSWERS(S)✔✔a //chip //is //a //inclusion
