The 21-year-old 'Wrecking Ball' singer split from her fiance in September last year and claims she doesn't know where the USD 100,000 sparkler is currently located, reported Contactmusic.
"Don't know. Think it's in the shower," Cyrus said.
The singer added she and Hemsworth, 24, are still on good terms and in contact with each other.
"We still talk and communicate. I was with him since I was 16 and nothing is ever going to make that go away. I've known this guy all that time and if it doesn't work out I can still smile and love him and he can love me and that's great, that's the way to be," she said.