2 Metaphors for sapphire

Sapphire, turquoise, ruby, opal, Emerald, diamond, amethyst, are our sisters from the beginning, And our brothers are iron, lead, zinc, Copper and silver and gold.

The crag-torn sky is not the sky I love, But one unbroken sapphire spanning all; And nobler than the branches of a pine Aslant upon a precipice's edge Are the strained spars of some great battle-ship Plowing across the sunset.

2 Metaphors for  sapphire