"Moon" and "June" makes a clumsy rhyme.)
Upon the terrace a maiden fair
Was gazing the waters o'er,
And dreaming of vows of love she ne'er
Would hear, as in days of yore.
("Days of yore," that's fine.) And her soft, sad eyes
Looked up at the starry night,
She kissed a fair ruby ring, with sighs,
Which shone on her fingers white.
(You put the words as it suits you best;