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...What is a gem introductory ideas o gems have been part of human history for over years very early were generally organic materials examples include left right coral amber and vegetable ivory tagua nuts most used today are inorganic minerals crystal probably derived from alluvial sources as found rather ordinary looking unlike cut gemstones there many different kinds come in colors can be synthesized enhanced commonly simulants synthetics names trade or commercial obscure the true identity gemstone simulant material this course we will consider factors that affect their value where form how identified why colored other important gemology concepts such enhancement related issues naturally occuring desirable its beauty valuable rarity sufficiently durable to give lasting pleasure it should but need not crystalline determined by brilliance iridescence color sparkle play against heat common household chemicals easily scratched broken brittleness measure s tendency crack cleave rare typicall...