'Pure' in the Bible

Then I said, "Let them place a pure diadem on his head." So they placed the pure diadem on his head and clothed him with fine garments while the angel of the LORD was standing beside them.

He asked me, "What do you see?" I replied, "I see a menorah of pure gold with a receptacle at the top and seven lamps, with fourteen pipes going to the lamps.

"Tyre built itself a fortification, hoarding silver like dust and pure gold like mud in a street.