Chalkedon names the third precious stone listed among the city wall's foundations.

The attested use names a precious stone as the third in the sequence of foundations for the city wall.

1. A foundation's listed precious stone · dominant

   In Revelation 21:19, the nominative singular masculine form occurs in the sequence naming the city wall's foundations; the APB renders the third as “chalcedony” while describing the foundations as adorned with precious stones.

   Revelation 21:19

In the Anselm Project Bible: In Revelation 21:19, the APB presents it as “chalcedony” in the list of precious stones assigned to the foundations. The verse is read as a whole.