Some statements are given, followed by some conclusions. Consider the statements to be true even if they seem to be at variance from commonly known facts. Decide which of the given conclusions follow from the given statements.
Statements:
Some pearls are gems.
All gems are diamonds.
No diamond is stone.
Some stones are corals.
Conclusions:
I. Some stones are pearls.
II. Some corals are diamonds.
III. No stone is a pearl.