The great twisted neck-rings of the Bronze and Iron Ages.
A torc is a rigid neck-ring, usually open at the front with substantial terminals. Bronze Age gold torcs are often bar-twisted or ribbon-twisted; Iron Age masterpieces — buffer, ring, and loop terminals, sometimes electrum wire cables — are among Europe's finest ancient metalwork.
Fragments are the realistic find: a terminal, a length of twisted rod, or a straightened bar with old twist-lines. The regular spiral of an ancient twist differs from modern wrought gates and machinery scrap; terminals show casting and finishing detail no farm implement carries.
Any suspected torc, whole or fragmentary, in gold or silver, is very likely to qualify as treasure where such law exists — report it properly and record the exact findspot. Weigh, measure, and photograph in place if the law permits; context multiplies the find's importance many times.
Identifying brooch and fibula types