a cut and polished precious stone or pearl fine enough for use in jewelry.
something likened to or prized as such a stone because of its beauty or worth: His painting was the gem of the collection.
a person held in great esteem or affection.
muffin ( def 1 ).
British Printing. a 4-point type of a size between brilliant and diamond.
verb (used with object), gemmed, gemming.
to adorn with or as with gems; begem.
Jewelry. noting perfection or very high quality: gem color; a gem ruby.

1275–1325; Middle English gemme < Old French < Latin gemma bud, jewel; replacing Middle English yimme, Old English gim(m) < Latin

gemless, adjective
gemlike, adjective

2. treasure, prize, jewel, pearl. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
gem (dʒɛm)
1.  a precious or semiprecious stone used in jewellery as a decoration; jewel
2.  a person or thing held to be a perfect example; treasure
3.  a size of printer's type, approximately equal to 4 point
4.  (NZ) a type of small sweet cake
vb , gems, gemming, gemmed
5.  (tr) to set or ornament with gems
[C14: from Old French gemme, from Latin gemma bud, precious stone]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

O.E. gim, from L. gemma "precious stone, jewel," originally "bud," from the root *gen- "to produce" (see genus).
Online Etymology Dictionary, © 2010 Douglas Harper
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Computing Dictionary

GEM definition

operating system
One of the first commercially available GUIs. Borrowing heavily from the Macintosh WIMP-style interface it was available for both the IBM compatible market (being packaged with Amstrad's original PC series) and more successfully for the Atari ST range. The PC version was produced by Digital Research (more famous for DR-DOS, their MS-DOS clone), and was not developed very far. The Atari version, however, continued to be developed until the early 1990s and the later versions supported 24-bit colour modes, full colour icons and a nice looking sculpted 3D interface.
The Free On-line Dictionary of Computing, © Denis Howe 2010
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American Heritage
Abbreviations & Acronyms
  1. Gemini

  2. ground-effect machine

The American Heritage® Abbreviations Dictionary, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Example sentences
It was beautiful, a gem of pure happiness that life throws you once in a while.
He had it cut into a five-carat gem and set as a ring.
These are mainly residential streets to the left, but you never know what
  little gem you might find.
Jewellers and gem traders seem to have been the targets of two of the bombs.
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