This is a term meaning the Abode of Jewels. This was the name given to one of the capitals of the peris of Persian romance. These were beings of angelic or well-disposed behavior, who inhabited the earth, along with the divs or evil-disposed, before the creation of man. After this event, the peris became inhabitants of the aerial regions, and had three capitals: Shad-u-kam (pleasure and desire), Gauher-Abad, and Amber-abad (city of Ammbergris). A.G.H.
Source: 81, 177.