The Curious Lore of Precious Stones Being a description...

While the arrangement differs in Revelation, the stones are nearly identical. For chalcedonius, we should probably read carchedonius, a name of the ruby; sardonyx is the onyx of Exodus; the jacinth (sapphire) is probably the “ligure”; the sapphire was the lapis-lazuli, and sardius is equivalent to carnelian. There thus remains only the chrysoprase, which for some reason has substituted the agate. In the eventual association of the foundation stones with the months, the first, the jasper, was assigned to March, with which month the year was reckoned to begin.