Assertion: amber | /r/HasProperty | dubbed the gold of the north
Facets:
value: as an important commodity
type: OTHER
value: sometimes
type: TEMPORAL
Source sentences:
text: As an important commodity, sometimes dubbed "the gold of the north", amber was transported from the North Sea and Baltic Sea coasts overland by way of the Vistula and Dnieper rivers to Italy, Greece, the Black Sea, Syria and Egypt over a period of thousands of years.