Oman Adorned by Pauline Shelton Robert Richmond / Apex London 1997 p 75-p 77 bottom; p 164
Catalog of the Oman exhibition in the Nieuwe Kerk Amsterdam 2009 page 131
An account of an overland journey from Leskairee to Meskat and the Green mountains of Oman Trans. Bombay Geographical Society Vol VIII 1847
Wellsted Travels in Arabia 1838 London John Murray
Islamic Art in Oman page 336 Pict 2
Traditional silver jewelry and handicrafts from Oman by Jean Greffioz 2009 (privately published) page 40 and 41 fig 3.9 and 3.10 has photo with a similar item.
Richard Francis Burton's description of Arab women in his book Zanzibar: City, Island and Coast London 1872 p114-115 was far from flattering "The half caste Zanzibar girl enviously eyes the Arab woman, a heap of unwashed cottons on invisible feet, with the Masqat masque exposing only her unrecognizable eyeballs. The former wears a single piece of red silk or chequered cotton. Her frizzly hair is twisted into pigtails; her eyelids are stained black; her eyebrows are lengthened with paint; her ear-rims are riddled with a dozen holes to admit rings, wooden buttons or metal studs, whilst the slit lobes, distended by elastic twists of coloured palm-leaf whose continual expansion prodigiously enlarges the aperture, are fitted with a painted disk, an inch and a half in diameter. If pretty, and therefore wealthy, she wears heavy silver earrings run through the shell of the ear; her thumbs have similar decorations and massive bangles of white metal adorn, like manacles and fetters, her wrists and ancles. One wing of her nose is bored to admit a stud- even the patches of Europe were not more barbarous. "
Below you UAE Youtube film discussing a similar set of Omani silver earrings: