July birthstone (4)
(Other definitions for cornelian that I've seen before include "gem" , "Gemstone" , "Dull red stone; lone cairn (anagram)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">july birthstone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for ruby that I've seen before include "Precious red gem" , "Fortieth anniversary stone" , "Stony girl" , "Red precious stone" , "killed an assassin" .)