וַיְצַפֵּ֛הוּ זָהָ֥ב טָה֖וֹר מִבַּ֣יִת וּמִח֑וּץ וַיַּ֥עַשׂ ל֛וֹ זֵ֥ר זָהָ֖ב סָבִֽיב׃
And he overlaid it with pure gold within and without, and made a crown of gold to it round about.
Read kabbalistic (mystical) interpretation of Exodus 37:2: and classical mystical sources.