Red gem (4)
'red gem' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for ruby that I've seen before include "Gemstone comprising mainly aluminium oxide" , "Deep red variety of corundum" , "A red jewel" , "Jack perhaps" , "Stony girl" .)
'red gem' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for garnet that I've seen before include "Hard glassy mineral used as a gemstone" , "Semi-precious stone of deep transparent red" , "Deep red gem stone" , "Glassy red, yellow or green gemstone" , "Semi-precious stone of argent type" .)