Chrysoprasos combines 'gold' (chrysos) with 'leek' (prason), describing a golden-green precious stone, a variety of chalcedony with an apple-green color touched with golden tones. John lists it as the tenth foundation stone in the New Jerusalem's foundations. Like the other foundation stones, chrysoprase contributes its unique color to the city's brilliance, the varied hues together creating a spectrum of divine beauty. The combination of golden and green tones symbolizes both the preciousness of gold and the life-giving quality of green vegetation, though the primary emphasis is on the stone's contribution to the city's glorious appearance.