This gleaming wall is lined with a fine lattice of gold.
Wondrous Item 225,000 gp
This enchanted gold lines the walls, ceiling, and floor of a chamber up to 10 by 10 by 10 squares. No scrying sensor can cross a surface lined with the material or manifest within a chamber fully shielded by the material, unless the sensor is created by a creature of 21st level or higher.
Published in Dragon Magazine 383, page(s) 47.