These two tiles comes from a curving frieze and are linked so that when they were in place the lack of a straight join could have fooled the viewer into believing that there was no join between them. The outlines of the arabesques are also much more carefully delineated than is normally found on tiles; there is a mathematical precision to the decoration, shown clearly in the central knotted motif on the lower tile.
A number of the same features are found on a mihrab tile in the David Collection, Copenhagen (Folsach, Kjeld v.: Islamic Art, The David Collection, Copenhagen, 1990, no.151, p.113). The main decoration is of white arabesques on a cobalt-blue ground, the outlines are formed of both full and dotted lines, and small areas forming panels within the design are coloured either black or turquoise. That mihrab is dated AH 712/1312 AD, giving a close idea of the date of the present tiles.