Revelation 21:20

χρυσόλιθος … τοπάζιον. According to the best authorities, the ancient application of these names was the reverse of the modern. Chrysolite ought, according to the etymology, to be a “golden stone,” while the modern chrysolite is green. As early as Epiphanius the oriental chrysolite or chrysoberyl had taken the name of chrysolite which passed from it to the softer peridot, the ancient topaz, and as the chrysoberyl was also a “topaz” this became a possible name for all yellow stones.

χρυσόπρασος. A variety of beryl, of a more yellowish green; probably one of the stones now called chrysolite, our chrysoprasus being then unknown.

ὑάκινθος. Our sapphire, see on Revelation 9:17.

ἀμέθυστος. This, the emerald, sardius, sardonyx and beryl are undoubtedly the stones now so called.