Wearing a gold mangal sutra or diamond Mangalsutra is steeped in tradition – it is given the status of a sacred thread that signifies the sacred relationship …What is Mangalsutra? … The word mangal means auspicious and Sutra means thread – together mangalsutra means an auspicious thread uniting the souls. The groom ties the auspicious thread around the bride’s neck on the day of their holy nuptial as the significance that their relationship would be as auspicious as the thread.