en_tn/pro/27/21.md

A crucible is for silver and a furnace is for gold

This refers to how gold and silver are refined. A metal is refined by heating it to a high temperature so that it melts and the impurities may be removed. See how you translated the very similar phrase in Proverbs 17:3. Alternate translation: "A crucible is used to refine silver and a furnace is used to refine gold" (See: rc://en/ta/man/translate/figs-explicit)

crucible

a container used for heating substances to very high temperatures (See: rc://en/ta/man/translate/translate-unknown)

furnace

an oven that can be made extremely hot (See: rc://en/ta/man/translate/translate-unknown)

a person is tested when he is praised

This can be stated in active form. Alternate translation: "when one praises a person, they are also testing that person" (See: rc://en/ta/man/translate/figs-activepassive)