Easton's Bible Dictionary (1897)
Golden leek, a precious stone of the colour of leek’s juice, a greenish-golden colour (Rev. 21:20).
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
CHRYSOP'RASUS. Rev 21:20. A stone of a "golden leek" or green color, as its name imports. It is of a most agreeable hue, opaque, and extremely hard.