Below are possible answers for the crossword clue Ruby, for one.
3 letter answer(s) to ruby, for one
DEE
an electrode with a large interior cavity, shaped like the letter "D", used in opposed pairs to accelerate particles in a cyclotron.
GEM
a crystalline rock that can be cut and polished for jewelry; "he had the gem set in a ring for his wife"; "she had jewels made of all the rarest stones"
a person who is as brilliant and precious as a piece of jewelry
a precious or semiprecious stone incorporated into a piece of jewelry
a sweet quick bread baked in a cup-shaped pan
art highly prized for its beauty or perfection
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