Spinel. A mineral occurring in octahedrons of great hardness and various colors, as red, green, blue, brown, and black, the red variety being the gem spinel ruby, It consists essentially of alumina and magnesia, but commonly contains iron and sometimes also chromium. The fine specimens of spinel ruby are worth rather more than half as much as the diamond.

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“Hope in this life is a perishing thing, but the hope of good men, when it is cut off from this world, is but removed like a tree, transplanted from this nursery to the garden of the Lord.”
–Matthew Henry, Commentary, Job 19