Online jewellery store BlueStone on Monday raised $30 million in Series D round of funding led by Accel Partners and financial services firm IIFL Holdings. Kalaari Capital, RB Investments and IvyCap Ventures also participated in the round. Founded in 2011 by Gaurav Singh Kushwaha and Vidya Nataraj, BlueStone lets users buy gold, diamond, gemstone and other jewellery through its platform.