Abstract: A question reproducible exercise book for reproducing questions which are set in examinations held periodically and provided in the form of being answered by choosing an appropriate alternative among a plurality of alternatives with respect to the question sentence or a non-relevant in the event of not finding the appropriate alternative, in which overlapping questions specifying information including at least numbers of questions and alternatives appeared in a particular examination and overlapping in examinations held earlier and later than the above-mentioned examination is indicated instead of omitting one or both of a portion of questions and alternatives overlapping in examinations held earlier and later than a particular examination and a portion of explanations with respect to the overlapping questions and alternatives.

Abstract: A gem certificate comprising identification data based upon the examination of precious stones and precious metals used in jewelry. The gem certificate further has appearance data on the jewelry including at least two or more pictures or figures of the jewelry, and date data including the date of issue of the gem certificate and/or an issuing number.