Gemology Exam Questions with 100% Correct Answers

Important localities for colored stone mining? Correct Answer Thailand, Cambodia, Pakistan, India, Vietnam, Sri Lanka, Burma, Eastern coast of africa, madagascar Factors affecting mining Correct Answer Accessibility - mountain ranges Climate - monsoons, frozen Canada Demand - is the stone popular enough to mine? Politics - largely responsible for the availability of some gemstones (tanzanite). Mining methods - what is viable in the area? Primary deposit Correct Answer Gems found in the rock that carried it to the surface or close to the surface Secondary deposit Correct Answer Gems found away from their primary source Elluvial deposit Correct Answer A secondary deposit where gems erode from their source rock and are subject to gravitational movement and accumulation Alluvial deposit Correct Answer a secondary deposit where gems are eroded from the source rock and then transported away from the source by water and further concentrated. Placer Correct Answer A workable deposit of gem minerals with an economic potential. Karat Correct Answer A measure of the fineness of gold Carat Correct Answer A measure for the weight of gemstones. 1 carat = 1/5 gram or 200 mg. 142 carats = 1 oz Cutting Correct Answer Main goal of the cutter is to get the most valuable gem out of the rough that he can. What shape is best suited? What cut will maximize the color or light return? Cut to maintain carat weight? Position inclusions? Value Correct Answer One of the most important things in the value of a colored gem is the color: intensity, tone, hue Pipe or open pit mining Correct Answer High yield, expensive, destructive Alluvial mining Correct Answer large scale is expensive, small scale is labor intensive Peridot is idiochromatic Correct Answer This means it is self colored by its structure Diamond is more dense than quartz Correct Answer 1 carat diamond will look smaller than 1 carat amethyst