Concise Bible Dictionary:

The well-known precious metal. It was discovered very early (Gen. 2:11-1211The name of the first is Pison: that is it which compasseth the whole land of Havilah, where there is gold; 12And the gold of that land is good: there is bdellium and the onyx stone. (Genesis 2:11‑12)). It was purified by fire (Prov. 17:33The fining pot is for silver, and the furnace for gold: but the Lord trieth the hearts. (Proverbs 17:3); Zech. 13:99And I will bring the third part through the fire, and will refine them as silver is refined, and will try them as gold is tried: they shall call on my name, and I will hear them: I will say, It is my people: and they shall say, The Lord is my God. (Zechariah 13:9)): and we read of “choice gold,” “fine gold,” “pure gold.” Precious things are compared with gold to show their value (Psa. 119:72,12772The law of thy mouth is better unto me than thousands of gold and silver. (Psalm 119:72)
127Therefore I love thy commandments above gold; yea, above fine gold. (Psalm 119:127)
). It was extensively used in the tabernacle and in the temple; some things being made of gold, and others being overlaid with it. For fabrics the gold was beaten into thin plates and cut into wires to be woven with the blue, the purple, and the fine twined linen. The heavenly Jerusalem is also described as of “pure gold” (Rev. 21:18,2118And the building of the wall of it was of jasper: and the city was pure gold, like unto clear glass. (Revelation 21:18)
21And the twelve gates were twelve pearls; every several gate was of one pearl: and the street of the city was pure gold, as it were transparent glass. (Revelation 21:21)
). Being the most costly metal it is regarded as symbolical of what pertains to God, and as signifying divine righteousness. The Lord Jesus counseled the poor Laodiceans to buy of Him “gold tried in the fire,” that they might be rich (Rev. 3:1818I counsel thee to buy of me gold tried in the fire, that thou mayest be rich; and white raiment, that thou mayest be clothed, and that the shame of thy nakedness do not appear; and anoint thine eyes with eyesalve, that thou mayest see. (Revelation 3:18)).

Strong’s Dictionary of Greek Words:

diminutive of 5557; a golden article, i.e. gold plating, ornament, or coin
KJV Usage: