Boyd’s Bible Dictionary:
(golden leek). An apple-green variety of chalcedony (Rev. 21:20).
Concise Bible Dictionary:
Supposed to be a variety of Chalcedony of a green shade (Rev. 21:20). The word χρυσόπρασος does not occur in the LXX.
Chalcedony (var. Jasper)
Jackson’s Dictionary of Scripture Proper Names:
golden green: golden achievement