This 14K yellow gold O Thongthai zebra jasper sapphire signet ring is cast with a wide, polished band. The oval top plate is inlaid with a black and white gemstone surrounded by a ridged border. The centrepiece is a blue cabochon sapphire sugarloaf weighing 3.3 carats. Apparently the jasper stone is 'very motivating, mood lifting and energetic.' Not that we needed to be convinced to get this O Thongthai ring.