(Good)
Gold is the material of the New Jerusalem.
Revelation 21:18 ‘And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass.’
(Evil)
This is commonly used in making graven images in the worship of idols.
Ezekiel 16:17 ‘Thou hast also taken thy fair jewels of my gold and of my silver, which I had given thee, and madest to thyself images of men, and didst commit whoredom with them,’