GIA Diamond Grading Quiz 1 - Questions and Answers

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GIA Diamond Grading Quiz 1 - Questions and Answers The more an inclusion differs in color from its host diamond the more obvious it is A feather that reaches a bezel surface as well as the surface o... f the pavilion main directly under the bezel should be plotted on both the crown and pavilion diagrams In a stone with these clarity characteristics, which would probably be the grade-setting characteristic? Feather Which would disqualify a stone from being IF Pinpoint Diamonds with minute inclusions at 10x are VVS1 or VVS2 A reflector is the result of the inclusions Position A round brilliant VVS diamond could have a small pinpoint under a lower girdle facet VS1 and VS2 stones would be expected to have minute inclusions One factor used to determine the clarity grade of a diamond is an inclusions Location A stone with only a few extra facets on its pavilion that can't be seen face up should be graded IF Inclusions are most visible when located directly under the table Squares or rectangles, trigons, and parallel grooves are types of growth marks The crystal planes most suitable for cleaving a diamond are the octahedral planes Which is the softest crystal direction in a diamond Dodecahedral Crystal shape is important in evaluating rough because it affects the amount of weight retained after cutting The diamond term glassy refers to a well-formed octahedral crystal Naturally occurring, inorganic substance with a characteristic chemical composition and usually a characteristic crystal structure is known as a Mineral The habit of gem quality diamond is the Octahedron Another name for the cubical crystal system is Isometric In diamonds, cleavage is caused by relatively wide spaces between some atomic planes A flat triangular twinned diamond crystal is called a Macle The strongest of all atomic bonds are called Covalent Solid matter with atoms arranged in a regular, repeating pattern is called a Crystal The smallest group of atoms with a characteristic chemical composition and the basic crystal structure of a mineral is called a unit cell Specific gravity of gem quality 3.52 Atoms in a gem that aren't part of its essential chemical composition are called trace elements A notch scratched into a diamond rough to prepare it for cleaving is called a Kerf The number of facets on a single cut diamond is 17 or 18 An early brilliant that has a circular girdle outline is called old European cut The devices that grip and hold a diamond for polishing are known as the dop and tang The cutting style with a flat bottom and a variable number of facets that come to a peak at the top is the rose cut The person who decides where to mark diamond rough for fashioning is called the Planner The directional properties and structural features of a diamond crystal do not really matter in laser sawing The rotary saw contributed to the diamond cutting industry by allowing for grater weight retention from rough To help determine crystal directions, diamond cutters look for growth marks A diamond cutters main objectives are to produce an attractive finished diamond and maximize profits The process of polishing the star and upper and lower girdle facets is called Brillianteering When the rough has a frosty or non transparent surface, the cutter can look for inclusions by polishing a window to view the interior The cast-iron disc on which a diamond is polished is called a Scaife In the cutting sequence, the crown and pavilion mains are polished by the Blocker The relative size, arrangement, and contrast of bright and dark areas that result from a diamonds internal and external reflections is called Pattern The flashes of color you see in a polished diamond Fire [Show More]

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