RobH_en_tn/rev/21/18.md

The wall was built of jasper and the city of pure gold

This can be stated in active form. Alternate translation: "Someone had built the wall with jasper and the city with pure gold" (See: rc://en/ta/man/translate/figs-activepassive)

pure gold, like clear glass

The gold was so clear that it is spoken of as if it were glass. (See: rc://en/ta/man/translate/figs-simile)

jasper

This is a valuable stone. Jasper may have been clear like glass or crystal. See how you translated this in Revelation 4:3. (See: rc://en/ta/man/translate/translate-unknown)