Following are a number of back-translations as well as a sample translation for translators of Proverbs 17:3:

• Kupsabiny: “The goodness/quality of gold and silver is seen/appears when they are put through fire,
  but God is the one who tests the thoughts/minds of the people.” (Source: Kupsabiny Back Translation)
• Newari: “Gold and silver are tested by putting them in the fire.
  But the Lord tests our hearts.” (Source: Newari Back Translation)
• Hiligaynon: “The LORD tests our (incl.) heart like gold and silver which is-tested on fire if it is pure or not.” (Source: Hiligaynon Back Translation)
• Kankanaey: “Gold and silver is cleaned by-means-of fire. God also gives a person tests so-that his mind will-become-good.” (Source: Kankanaey Back Translation)
• English: “Workers put silver and gold in a very hot furnace to burn out what is impure,
  and Yahweh similarly examines people’s inner beings to see if they are pure.” (Source: Translation for Translators)