Objects in the British Museum

It's gold - in the rare form of votive plaques - seven of them (one removed temporarily), dating to the 3rd or 4th century, when Britain was a Roman province -

 A closer view -

 ... and a better explanation -

 "The hoard" - gold and silver - was found in 2002 in Hertfordshire. They were probably taken from a temple and buried -

 Elsewhere in Europe, a thousand years later ...

 And some carved ivory -