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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“And the peace of God, which transcends all understanding, will guard your hearts and your minds in Christ Jesus.”
– Philippians 4:7