The answer is: Silver

Pro 10:20

In Proverbs 10:20, the metaphor comparing the tongue of the just to silver beautifully captures the idea of purity and value. Much like silver, which is refined and precious, the words of a just person—those who embody integrity and righteousness—are viewed as something sought after and cherished. Silver has long been associated with clarity and brilliance, reflecting how kind and truthful words can illuminate dark situations, giving hope and encouragement.

Interesting to note, many ancient cultures held silver in high regard as a symbol of justice; its gleam represents wisdom speaking with clarity. Parallel themes can be found throughout scriptures. For instance, Psalm 12:6 mentions, "The words of the Lord are flawless, like silver purified in a crucible." It's intriguing to see how many aspects of nature and craft found their way into scripture to teach valuable life lessons.

Also, consider that just as silver must often go through fire to emerge pure, so too must our words often pass through a rigorous personal process of thought and intent before they're spoken. This idea aligns with the notion of moderating one's speech, illustrating the importance of mindful communication. Caring and thoughtful speech can act as a balm to relationships and society, underscoring the timeless value of clear and honest dialogue throughout biblical wisdom.