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 fi