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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“What good will it be for a man if he gains the whole world, yet forfeits his soul? Or what can a man give in exchange for his soul?”
– Matthew 16:26