'Foundation stones' in the Bible

The wall of the city had twelve foundation stones, and on them were the twelve names of the Lamb's twelve apostles.

The angel who spoke to me had a golden measuring rod with which to measure the city and its foundation stones and wall.

As for the foundation-stones of the city wall, which were beautified with various kinds of precious stones, the first was jasper, the second sapphire, the third chalcedony, the fourth emerald, the fifth sardonyx, the sixth sardius,