Fiery or milky gem (4)
I believe the answer is:
opal
(Other definitions for opal that I've seen before include "Rock" , "Lustrous stone" , "Semi-transparent gemstone" , "precious jewel" , "it may be highly valued" .)
I believe the answer is:
opal
(Other definitions for opal that I've seen before include "Rock" , "Lustrous stone" , "Semi-transparent gemstone" , "precious jewel" , "it may be highly valued" .)