Jewellery firm BlueStone Jewellery & Lifestyle Limited, which operates under the flagship brand 'BlueStone', will launch its initial public offer next week on August 11. The company is seeking a valuation of around $888 million or ₹7,800 crore, Moneycontrol reported, citing sources. The IPO proceeds will be utilised for working capital requirements and general corporate purposes, the firm said.