Source : Webster's Revised Unabridged Dictionary (1913)

Rosiness \Ros"i*ness\, n.
   The quality of being rosy.

Source : WordNet®

rosiness
     n 1: a rosy color (especially in the cheeks) taken as a sign of
          good health [syn: {bloom}, {blush}, {flush}]
     2: a healthy reddish complexion [syn: {ruddiness}]