Revelation 21:17

The wall] i.e. the thickness of the wall: cp. Jeremiah 51:58. The angel] RV 'an angel,' i.e. the angelic cubit was of the same length as a human cubit.

19f. The stones are, with exceptions, the same as those in the high priest's breastplate (cp. Exodus 28:17.; Exodus 39:10.), and those ascribed to the king of Tyre (Ezekiel 28:13). Flinders Petrie (HDB.) says that precious stones were not so exactly distinguished from one another in ancient days as they are now. 'Jasper' was, according to him, green jasper; the 'sapphire' was our lapis-lazuli; the 'chalcedony' was dioptase (silicate of copper); the 'emerald' should be rock-crystal, cp. Revelation 4:3 note; 'sardonyx' was the red and white onyx; the 'sardius' was red jasper; the 'chrysolite' in St. John's time was the present topaz; the 'beryl' was either beryl, i.e. an opaque emerald, or green felspar; the 'topaz' was peridot; the 'chrysoprasus' was, probably, the green chalcedony; the 'jacinth' was the sapphire; the 'amethyst', was the modern amethyst.