gem 
(jĕm)
(jĕm)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 the Appendix of Indo-European roots.]