in heraldry.
The topaz represents “or” (gold), or the planet Sol.
The pearl or crystal represents “argent” (silver), or the planet Luna.
The ruby represents “gules” (red), or the planet Mars.
The sapphire represents “azure” (blue), or the planet Jupiter.
The diamond represents “sable” (black), or the planet Saturn.
The emerald represents “vert” (green), or the planet Venus.
The amethyst represents “purpure” (purple), or the planet Mercury.
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Entry taken from Dictionary of Phrase and Fable, edited by the Rev. E. Cobham Brewer, LL.D. and revised in 1895.