According to the Jamieson-Fausset-Brown Commentary, which quotes Pliny the Elder, the chrysoprase recorded in Revelation 21 is somewhat pale and has the purple color of the amethyst.
Chrysoprase is not mentioned in the Bible as one which was embedded in the High Priest's breastplate (Exodus 28:17 - 21, with parallel list in Exodus 39:10 - 13). It is also not recorded in the Bible as a gemstone that Lucifer was created with (Ezekiel 28:13) before he turned himself into God's enemy.
Eight out of the ten major Bible translations used in this series translate chrusoprasos as "chrysoprase," while the other two refer to it as "chrysoprasus." This precious stone is a quartz-based gem that is a variety of chalcedony. The gem, commonly used in necklaces, receives its apple-green color from nickel.
Placed against the body, chrysoprase was believed to produce shivering and chills that began in the chest region and spread to the entire body. Additionally it was once believed that thieves, sentenced to be beheaded or hanged, who placed this stone in his mouth, would be able to escape their executioners as if they were invisible (Curious Lore of Precious Stones, pages 11, 67 - 68).