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Those that do not have a visible inclusion are known as " eye-clean " and are preferred by most buyers , although visible inclusions can sometimes be hidden under the setting in a piece of jewelry.Most inclusions present in gem-quality diamonds do not affect the diamonds ' performance or structural integrity . For an extra touch , draw an eagle on a piece of stabilizer ( figure I ) . Have each student write down his or her name and birthday on a piece of paper . But the survey says little about the quality or amount of that training ; it could be a one-time workshop on a piece of software or ongoing , one-on-one assistance in the classroom . In other words - that they wo n't use - if you draw a coordinate axes system on a piece of paper and put the wires on it and move the magnet , you 'll get a current , but if you tape the coordinate system to the magnet and move the magnet , you 'll get no current .