Postby dragonflywink » Mon Jan 20, 2020 12:07 pm
Though the stones are missing, looks typical of a Scottish pebble brooch, and if you use those three words for an internet search, should give you an idea of the wide variety of agates used. Suppose it could have been made in Australia or New Zealand to Scottish taste - but have seen other small Scottish items marked as 'STG SIL', probably the most easily identified, some early Alexander Ritchie IONA pieces. If interested, Dawes and Davidov's 'Victorian Jewelry' (1991) has a large, well illustrated chapter on pebble jewelry...
~Cheryl