Ratan Tata-backed jewellery retailer BlueStone said it has raised over $30 million in funding at a valuation of $410 million. The funding round was led by Sunil Kant Munjal, Chairman, Hero Enterprise. BlueStone Founder Gaurav Singh Kushwaha has confirmed the startup's plans for an initial public offering (IPO), with an aim to raise ₹1,500 crore.