gem (j?m)n.1. A piece of a valuable mineral or minerallike substance that has been cut, polished, or otherwise prepared for use as an ornament.2. a. Something that is valued for its beauty or perfection: a little gem of a book.b. A beloved or highly prized person.3. A muffin, especially a very small one.tr.v. gemmed, gem·ming, gems To adorn with gems.[Middle English gemme, from Old French, from Latin gemma; see gembh- in Indo-European roots.]American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.gem (d??m) n1. (Jewellery) a precious or semiprecious stone used in jewellery as a decoration; jewel2. a person or thing held to be a perfect example; treasure3. (Printing, Lithography & Bookbinding) a size of printer’s type, approximately equal to 4 point4. (Cookery) NZ a type of small sweet cakevb, gems, gemming or gemmed (Jewellery) (tr) to set or ornament with gems[C14: from Old French gemme, from Latin gemma bud, precious stone] ?gem?like adj ?gemmy adjCollins English Dictionary ? Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014gem (d??m) n., v. gemmed, gem?ming. n. 1. a mineral, pearl, or other natural substance valued for its rarity or inherent beauty. 2. something prized because of its beauty or worth. 3. a person held in great esteem or affection. v.t. 4. to adorn with gems. [1275?1325; Middle English gemme