Gravensten or Gravenstein: How To spell?

The word Gravensten is misspelled against Gravenstein, a noun meaning "A kind of fall apple, marked with streaks of deep red and orange, and of excellent flavor and quality."

Word contains consecutive vowels 'EI' in between alphabets gravenst & n is misspelled as 'E' as letter 'I' is phonetically igno
Wrong Spelling:  gravenst-e-n 
Correct Spelling:  gravenst-ei-n 
Explore spell check of Gravenstein to spell without errors.