Rashi: The beautiful ornament of Hashem, that He made it for grandeur for them - the Beis ha'Mikdash ("Hineni Mechalel Es Mikdashi Ge'on Uzechem" (24:21).

Radak: This is the Beis ha'Mikdash, which is the beautiful honor of Hashem, who is sanctified in it. [Yisrael] were beautified in it like ornaments. Hashem made it for Ga'on - Yisrael were proud and exalted in it over all nations, for Hashem's honor was seen in it in a supreme cloud and fire.

Malbim: This explains how they sinned via gold. (a) Their gold ornaments, they made them for pride and glory. Their grandeur was via their ornaments, via coveting gold. (b) Refer to 7:20:2:2.

Radak: They made it detestable - they put their abominable images there.

Malbim: They used gold to make idols.

Radak: They will distance [Hashem's honor], and be exiled from their land.

Malbim: Since they used gold to make idols, He made it like a Nidah, Midah k'Neged Midah ¹ .