Jasper - Vine's Expository Dictionary of New Testament Words
Jasper[ 1,,G2393, iaspis ]
a Phoenician word (cp. Heb. yash'pheh, e.g., Exodus 28:20; Exodus 39:16), seems to have denoted a translucent stone of various colors, especially that of fire, Revelation 4:3; Revelation 21:11, Revelation 21:18-Revelation 21:19. The sardius and the jasper, of similar color, were the first and last stones on the breastplate of the high priest, Exodus 28:17, Exodus 28:20.