J-L. Zimmermann, Collection de la Fondation Thétis, Geneva, 1987, pp. 42-3 and p. 152, no. 80.
It is suggested that earrings such as these would have been worn from a S-shaped loop. For similar from Rhodes, cf. F. H. Marshall, Catalogue of the Jewellery, British Museum, 1911, p. 97, no. 1174.