ἄργυρος

Matthew 10:9 ἄργυρον silver

Do not take along any gold or silver or copper in your belts.

Acts 17:29 ἀργύρῳ to silver

Therefore, being offspring of God, we should not think that the Divine Being is like gold or silver or stone, an image formed by man’s skill and imagination.

Here: The second precious material. 'Gold and silver' is the classic pairing in Jewish mockery of idols (Psalm 115:4).

1 Corinthians 3:12 ἄργυρον, silver,

If anyone builds on this foundation using gold, silver, precious stones, wood, hay, or straw,

Here: Another precious metal that survives fire and comes out refined. It is paired with gold as in the Old Testament lists of temple materials (1 Chr 29:2).

James 5:3 ἄργυρος silver

Your gold and silver are corroded. Their corrosion will testify against you and consume your flesh like fire. You have hoarded treasure in the last days.

Here: Silver, as metal or coin. Silver really does tarnish, so it makes the image half-realistic, while gold makes it deliberately impossible.

Revelation 18:12 ἀργύρου of silver

cargo of gold, silver, precious stones, and pearls; of fine linen, purple, silk, and scarlet; of all kinds of citron wood and every article of ivory, precious wood, bronze, iron, and marble;

Here: Silver, for coinage, plate and tableware. In the Roman world elaborate silver dinner services were a common display of wealth.