This is the 4265th most frequent German word.
echtes
"Real" or "genuine."
Here, 'echtes' is used as an adjective meaning 'real' or 'authentic,' describing the noun 'Kunstwerk' to emphasize the genuine and true characteristics of the artwork.
Das ist ein echtes Kunstwerk.
This is a real piece of art.
In this sentence, 'echtes' qualifies the noun 'Interesse,' meaning that the interest is sincere and not feigned.
Er hat ein echtes Interesse an diesem Thema.
He has a genuine interest in this topic.
The word 'echte' as an adjective preceding 'Diamanten' stresses the authenticity of the diamonds being discussed as truly genuine specimens.