The Trenoweth collar is one of the most important examples of later Iron Age metalwork associated with Cornwall. Fine decorated metalwork from this period is not especially common in west Cornwall, which makes the collar particularly significant. It is a bronze neck ring, about 15.2 centimetres in diameter, made with a lead core and set with clear and brown glass. Although first published in 1807 as a find from Trenoweth near Lelant, later evidence showed that it was actually discovered at Trenoweth in St Stephen in Brannel. The collar was found in 1793 during tin streaming, a form of mining that was long practised in Cornwall. A Borlase manuscript later identified the correct find spot and included a watercolour of the object. The collar was shown to the Society of Antiquaries in 1807, exhibited in Paris in 1867, and displayed in Truro in 1868. It passed through several collections, including that of Philip Rashleigh, before being purchased by the British Museum at Sotheby’s in 1895. Today, it is back in Cornwall and forms part of the collection of the Royal Cornwall Museum in Truro. Scientific analysis has shown that the collar was made using a complex combination of materials and techniques. The back plate is made from tin bronze, while the front plate is a brass containing zinc, lead, and some tin. These sections were joined with lead tin solder, and there is no evidence that the collar was ever gilded. The use of true brass with a high zinc content suggests a date after the Roman conquest, when this technology became available in Britain. The decoration is one of the most important features of the collar. It is divided into four balanced panels, each decorated with freehand incision, punched detail, and central glass settings. The designs include branching comma motifs, palmette forms, pendant triangles, and other patterns that belong to the wider visual language of later Celtic art. The collar has been compared with early Roman western objects, including a bronze neck ring from Portland in Dorset and a hinged collar from Wraxall in Somerset. The collar also connects with other decorated objects from south west Britain. Its pendant triangles resemble decoration on the mirror from the female grave at Trelan Bahow, St Keverne. Other motifs can be compared with mirrors from St Keverne and Stamford Hill, Plymouth, while its trumpet spiral forms relate to wider Celtic design traditions. Although the collar is not usually described as a masterpiece, it is important because it shows how older Celtic motifs continued in western and peripheral areas during the period of Roman influence. A second Cornish neck ring adds to the wider picture. In 2007, a public open day brought attention to a neck ring and small stone bowl found at Pentire, Newquay, by Mike Salter and later donated to the Newquay Old Cornwall Society. Specialists from the British Museum confirmed the neck ring as later Iron Age. It is complete, oval in shape, made from two separately cast sections of leaded bronze, and joined by a rear hinge and front catch. Its robust construction, decorated terminals, criss cross patterns, herringbone motifs, and iron pinned hinge place it within a western tradition of strong, practical, and conservative metalwork design. Together, the Trenoweth and Pentire collars show that Cornwall was home to skilled metalworkers working within a distinctive regional tradition.