This is the 588th most frequent Finnish word.
luonnon
"Luonnon" means "of nature" or "nature's" in English.
Here, 'luonnon' is in the possessive form (genitive) referring to 'nature's' beauty.
Luonnon kauneus hämmästyttää minua.
The beauty of nature amazes me.
In this sentence, 'luonnon' again shows possession, describing 'nature's' tones.
Pidän erityisesti luonnon sävyistä.
I particularly like the tones of nature.
Here 'luonnon' is part of a structured phrase, 'luonnon suojelu' (nature's protection), demonstrating possessive usage.