Diamond & Diamond Grading Exam questions and answers CORRECT!!!

Diamond & Diamond Grading Exam questions and answers CORRECT!!! Diamond & Diamond Grading Exam questions and answers CORRECT!!! Abrasion (Abr) - A series of minute nicks along the facet junctions of a fashioned diamond; gives the edges a white or fuzzy appearance. (Assignment 10) Adamantine luster - The highest degree of luster possible in a transparent material. (Assignment 8) Aggregate - A solid mass of individual, randomly oriented crystals, intergrown or held together by a natural binding agent. (Assignment 7) Alluvial deposit - A deposit where gems are eroded from their source rock, then transported away from the source and further concentrated. (Assignment 5) Angle of incidence - The angle at which a ray of light strikes a surface, measured from the normal. (Assignment 8) Angle of reflection - The angle between the normal and a reflected ray of light. (Assignment 8) Annealing - Using heat to stabilize irradiated color in gemstones. (Assignment 12) Appraisal - An estimation of the value of an article, usually for insurance purposes. (Assignment 1) Average girdle diameter - The result achieved by adding the smallest and largest girdle measurements of a round brilliant and dividing by two. (Assignment 14) Bast - Frosted rough diamond. "Bark" in Dutch. (Assignment 9) Bearded Girdle (BG) - Very small feathers that extend from the girdle surface into the stone; can result from the cutting process. (Assignment 10) Belly - The slightly curving center of the long side of a pear, marquise, heart, or oval. (Assignment 16) Beneficiation - A commitment to reserve a portion of the resources derived from any country for the economic development of that country. (Assignment 3) Best Practices Principles (BPP) - De Beers' formalized commitment of itself and its sightholders to the highest ethical standards. (Assignment 3) Blemish - Clarity characteristic that's confined to the surface of a polished gemstone. (Assignment 10) Block caving - Underground mining that involves building a concrete-lined tunnel under an ore deposit, then collecting the ore through openings in the liner. (Assignment 6) Blocking - Placing the first 17 or 18 facets on a diamond. (Assignment 9) Bow-tie - A dark area across the center of an elongated brilliant cut. (Assignment 16) Brick-and-mortar retailDiamond & Diamond Grading Exam questions and answers CORRECT!!!er - A traditional store consisting of walls and a fixed location. (Assignment 3) Brightness - The effect of all the diamond's internal and external reflections of white light. (Assignment 8) Brilliant cut - A cutting style in which triangular and kite-shaped facets radiate from a gem's center toward its girdle. (Assignment 16) Brillianteering - Placement and polishing of the star and upper and lower girdle facets. (Assignment 9) Bruise (Br) - A tiny area of impact accompanied by very small, root-like feathers visible at 10X magnification; typically occurs at a facet junction. (Assignment 10) Bruting - Forming the basic face-up outline of a diamond to prepare it for faceting. (Assignment 9) Bulk sampling - Large-scale character sampling. (Assignment 5) Burn Marks (Brn) - Hazy surface areas that result from excessive heat or from uneven polishing caused by structural irregularities; also called polish marks or burned facets. (Assignment 10) Cavity (Cv) - An angular opening created when part of a feather breaks away. (Assignment 10) Central Selling Organisation (CSO) - An agency designed to purchase, sort, evaluate, and sell rough diamonds. (Assignment 2) Character sampling - Testing for the size, shape, clarity, and color of the diamonds in a deposit. (Assignment 5) Characteristic color - The basic color of a fancy-colored diamond. (Assignment 13) Chemical vapor deposition (CVD) - An industrial process adapted to allow growth of synthetic diamond from carbon-rich gas in thin layers onto a silicon or diamond surface. (Assignment 19) Chip (Ch) - A shallow opening caused by damage to the stone's surface; typically occurs at a girdle edge, facet junction, or culet. (Assignment 10) Clarity characteristic - Internal or external feature of a gemstone that helps determine its quality and establish its identity. (Assignment 10) Cleavage (Cl) - Large, severe, straight break along a plane of atomic weakness; considered an inclusion. (Assignment 10) Cleavage plane - Plane parallel to a possible crystal face, where a diamond can split cleanly when struck. (Assignment 7) Cleaver - A person who cleaves, or splits, a diamond along a cleavage plane. The cleaver might also be responsible for planning the fashioning of a polished gem. (Assignment 9) Cleaving - Dividing a diamond into two or more pieces along a cleavage plane. (Assignment 9) Cloud (Cld) - Many tightly grouped pinpoints that might be too small to distinguish individually at 10X but together have a hazy appearance. (Assignment 10)Diamond & Diamond Grading Exam questions and answers CORRECT!!! Color center - Structural defect that influences an object's absorption of light and can cause its color. (Assignment 12) Conflict diamonds - Diamonds used to finance violence and terror. (Assignment 3) Consignment - A selection of goods loaned to a dealer by another wholesaler or manufacturer. (Assignment 20) Core - Earth's innermost layer. (Assignment 4) Covalent bond - A chemical bond formed by two atoms sharing electrons. (Assignment 7) Craftsmanship - The care that goes into the fashioning of a polished diamond, as confirmed by its finish. (Assignment 15) Cratons - Ancient, large, and stable parts of the earth's continental crust. (Assignment 4) Critical angle - Angle between the normal and the maximum angle of refraction, which is the largest angle at which rays inside the diamond can escape. (Assignment 8) Cross worker - A person who performs the cross-working operations during diamond polishing; sometimes called a cross cutter. (Assignment 9) Cross working - Placing the bezel and pavilion facets on round and fancy shapes. Sometimes combined with blocking, especially on smaller stones. Also called cross cutting. (Assignment 9) Crown angle - The angle formed by the bezel facets and the girdle plane. (Assignment 14) Crown height percentage - The distance from the girdle plane to the table, expressed as a percentage of average girdle diameter. (Assignment 14) Crust - The surface and outermost layer of the earth. (Assignment 4) Crystal - Solid matter with atoms arranged in a regular, repeating pattern. (Assignment 7) Crystal (Xtl) - A mineral crystal contained in a diamond. (Assignment 10) Crystal planes - Internal directions parallel to a mineral's unit cell surfaces. (Assignment 7) Crystal shape (form) - Geometric shape of a well-formed crystal. (Assignment 7) Crystal structure (lattice) - Regular, repeating arrangement of atoms in a mineral. (Assignment 7) Crystal systems - Categories of crystals based on their symmetry and internal structure. (Assignment 7) Crystalline - Composed of crystals or related to crystals. (Assignment 7) Culet size - The size of the facet at the bottom of the diamond where the pavilion mains meet. (Assignment 15) Cuttable rough - Diamond rough with good enough size, shape, clarity, and color to produce a polished stone suitable for use in jewelry. (Assignment 5) Cutting center - A city, region, or country with a large number of gemstone manufacturers. (Assignment 3) Cutting style - The arrangement of a gem's facets. (Assignment 16) Darkfield illumination - Lighting of a diamond from the side against a black, non-reflective background. (Assignment 10) Dense media separation - A recovery process that separates diamonds from lighter material. Also called heavy media separation. (Assignment 6) Depth of field - The distance that's clear and sharp above and below a point you focus on with a magnifier. (Assignment 10) Design - A diamond's physical shape, including its proportions and durability, determined by decisions made during the fashioning process. (Assignment 15) Diamantaire - A knowledgeable, experienced, and successful person, usually a dealer or manufacturer, in the diamond trade. (Assignment 20) Diamond pipeline - The path diamonds followed from the mine to the consumer. (AssignmeDiamond & Diamond Grading Exam questions and answers CORRECT!!!nt 2) Diamond simulant - Any material that is not diamond or synthetic diamond, but which imitates a diamond's appearance and is used in its place. (Assignment 18) Digger - An independent diamond