Someone Tell Macca He Can't Sing...
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No best answer has yet been selected by pesnikinja. Once a best answer has been selected, it will be shown here.
For more on marking an answer as the "Best Answer", please visit our FAQ."Jewel" refers to the piece that clips into the center hole of the cd to keep it in place. It has a jewel-like design.
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http://www.faqfarm.com/Q/Why_is_a_CD_case_called_a_jewel _case