'A' finds a diamond ring in mall not knowing to whom it belongs. 'A' sells it immediately without attempting to discover the owner. Has 'A' committed any offence?

Illustration g of Section 378 A finds a ring lying on the highroad, not in the possession of any person. A, by taking it, commits no theft, though he may commit criminal misappropriation of property Section 403 IPC - Dishonest misappropriation of property—Whoever dishonestly misappropriates or converts to his own use any movable property, shall be punished with imprisonment of either description for a term which may extend to two years, or with fine, or with both.