Twelve pearls (dōdeka margaritai). These gate towers (pulōnes) were mentioned in Rev 21:12. Each of these (cf. Isa 54:12) is a pearl, one of the commonest of jewels (Mat 7:6; Mat 13:46; 1Ti 2:9).
Each one (ana heis hekastos). Distributive use of ana, but with the nominative (used as adverb, not preposition) rather than the accusative (as a preposition) as appears also in Mar 14:19; Joh 8:9; with kata in Rom 12:5, “a barbaric construction” according to Charles.
Street (plateia). For which word (broad way, hodos understood) see Mat 6:5, here the singular, but includes all the streets.
Transparent (diaugēs). Old word (from dia, through, augē, ray, shining through), here alone in N.T.