Nightbringer | The Arthurian Online Encyclopedia

Erec’s Scepter

Made entirely of a single emerald, it was a thick as a man’s fist and carved with the likenesses of every known kind of wild beast and man, fish and bird. 

Arthur put it into Erec’s hand at the latter’s coronation, whether as gift or loan I cannot say; but Chrétien’s Arthur is incredibly generous.