15ct yellow gold Australian miners nugget brooch, c.1860's. Attributed to R. & T. Willis, Melbourne Jewellers 1858 - 1874. Double bar brooch with a central nugget. The bars each having a curved end and a square cornered end. Length 43 mm. Weight 8.6 grams marked '15ct Unicorn' (illustrated centre Pages reference: Australian Jewellers Makers & marks, by Cavill Cocks & Grace, p.269