gold... silver... brass... iron. Put by Figure of speech Metonymy (of Cause), App-6, for what is made from them. The Figure of speech is completed by the words in italics.
and. Note the Figure of speech Polysyndeton (App-6), to emphasize the fifteen gifts of grace (3. 5, see App-10).
onyx. Compare Genesis 2:12.Exodus 25:7; Exodus 28:9.
2 Now I have prepared with all my might for the house of my God the gold for things to be made of gold, and the silver for things of silver, and the brass for things of brass, the iron for things of iron, and wood for things of wood; onyx stones, and stones to be set, glistering stones, and of divers colours, and all manner of precious stones, and marble stones in abundance.