As if they are rubies and corals.
They look like gems and coral.
As (lovely as) rubies and as (beautiful as) coral
As though they were rubies and pearls
As if/though they (F) are corundum/hardest mineral after diamond (rubies/sapphires/ topazes), and the corals
As beautiful as rubies and pearls
They are like rubies and coral-stone
As if they were rubies and small pearls
As if they (chaste maidens) were rubies and pearls
(These maidens will look) as if they were (made of) rubies and small pearls
(In beauty) they are like rubies and coral