|The Snettisham Great Torc. Found in Snettisham, UK. Electrum, 150 BC–50 BC. Diam. 19.9 cm. British Museum 1951,0402.2. (Photo: (c) The Trustees of the British Museum)|
I always wondered how they put them on.
Wonder no more: The British Museum discusses.
No, you don't pull the opening apart: essentially you twist them and slip them on. They are made of twisted wires that allow you to do this.
and other torcs were made with hidden hinges and clasps.