Sapphire. A variety of native corundum or aluminum sesquioxide. as the name of a gem the term is restricted to the transparent varieties of blue, pink, yellow, and other colors. The best specimens of the blue variety are nearly as valuable as the diamond. The sapphire is next to the diamond in hardness.

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“A gracious heart is contented by the melting of his will and desires into God's will and desires.”
–Jeremiah Burroughs, The Rare Jewel of Christian Contentment