OET interlinear 2 KI 25:15

uW Translation Notes:

Note 1 topic: figures-of-speech / reduplication

וְ⁠אֶת־הַ⁠מַּחְתּוֹת֙ וְ⁠אֶת־הַ⁠מִּזְרָק֗וֹת אֲשֶׁ֤ר זָהָב֙ זָהָ֔ב וַ⁠אֲשֶׁר־כֶּ֖סֶף כָּ֑סֶף

and=DOM and=DOM (Some words not found in UHB: and=DOM the,fire-pans and=DOM the,bowls which/who gold gold and=which silver silver he/it_had_taken great//chief/captain guard )

The author is repeating the words gold and silver in order to indicate that these articles were made of pure gold and pure silver. The description of them in 1 Kings 7:50 says that plainly, and you could do the same here in your translation. Alternate translation: [the firepans and the bowls that were pure gold and that were pure silver]

Note 2 topic: figures-of-speech / synecdoche

וְ⁠אֶת־הַ⁠מַּחְתּוֹת֙ וְ⁠אֶת־הַ⁠מִּזְרָק֗וֹת אֲשֶׁ֤ר זָהָב֙ זָהָ֔ב וַ⁠אֲשֶׁר־כֶּ֖סֶף כָּ֑סֶף

and=DOM and=DOM (Some words not found in UHB: and=DOM the,fire-pans and=DOM the,bowls which/who gold gold and=which silver silver he/it_had_taken great//chief/captain guard )

Since the firepans and bowls were both gold, the author seems to be using these articles to represent all of the articles that the priests used that were either pure gold or pure silver. If it would be helpful in your language, you could state the meaning plainly. Alternate translation: [all of the articles that were pure gold or pure silver]