Surat, Aug 7 (ANI): The demand for diamond studded sacred threads, known as rakhis, has shot up in Surat, the famed city of diamond cutters in Gujarat, ahead of Raksha Bandhan. On the occasion of Raksha Bandhan, a sister ties rakhi on the wrist of her brother as a token of love and wishes him prosperity and happiness. On his part, a brother pledges to protect his sisters' honour and in return offers gifts to her. In order to add a bit of sparkle to the celebrations, the jewellers are offering doting sisters a chance to present their brothers with diamond-studded rakhis. Meanwhile, a customer, Poorvi Sancheti, said as a sister she would want to buy the best for her brother. 'Rakhi' is a symbol of affection and bonding between sisters and brothers. It is celebrated on the full moon day of month of Shravana.