Assertion: diatom | /r/HasProperty | jewels of the sea
Facets:
value: because of their structural coloration
type: CAUSE
value: due to their optical properties
type: CAUSE
value: often
type: TEMPORAL
Source sentences:
text: Diatoms are often referred as "jewels of the sea" or "living opals" due to their optical properties.
text: Diatoms are referred to as the jewels of the sea because of their structural coloration.