Hyderabad, June 24: It's seems that Andhra Pradesh is in a treasure hunt with more than a dozen companies hunting for diamond, gold and other precious stones and metals in the state. Among the renowned companies are De Beers India, Geo Mysore, Adi Gold Mining, Deccan Gold Mining, Amil Mining, CRA, Anglo American Exploration, NMDC, Ramgadh Mining and Navarathna Minerals.