Which sentence uses a simile?

 - Ken's eyes are as green as emeralds.
 - Ken's eyes are bright green emeralds.
This sentence uses a simile:
Ken's eyes are as green as emeralds.
The words eyes and emeralds are compared using the word as.
This sentence uses a metaphor:
Ken's eyes are bright green emeralds.
The words eyes and emeralds are compared without the word like or as.