It appears that this original drawing of the Jewel Fresco has been adapted for the 1936 exhibition with the addition of a drawing of one of the beads. This fragment is the only part of the fresco that survives.
Bibliography
Evans, Arthur. 1921. The Palace of Minos at Knossos, I, pp. 312, 525-527, fig. 231, 383
Myres, John (ed.). 1936. British Archaeological Discoveries in Greece and Crete 1886-1936, p. 24