וְעָשִׂ֨יתָ לּ֥וֹ מִסְגֶּ֛רֶת טֹ֖פַח סָבִ֑יב וְעָשִׂ֧יתָ זֵר־זָהָ֛ב לְמִסְגַּרְתּ֖וֹ סָבִֽיב׃
And thou shalt make unto it a border of a handbreadth round about, and thou shalt make a golden crown to the border thereof round about.
Read kabbalistic (mystical) interpretation of Exodus 25:25: and classical mystical sources.