Which sentence uses a simile?

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