Rare suite of West Australian Levinson Operculum shell jewellery, c.1910-1930- i) 9ct yellow gold pink Operculum shell drop necklace stamped, Levinson, 9ct ii) 9ct yellow gold Operculum shell and seed pearl ring, stamped Levinson 9ct, Perth iii) sterling silver gilt, pink Operculum shell screw-back earrings, marked sterling