Basalt is a very distinctive natural stone. Its understated appearance and hardy temper are unique. It is a stone which leaves nobody unmoved. The Hainan black and grey basalt, counterpart of the Italian basaltina and the Australian bluestone, is our area of expertise.BBasalt is a very distinctive natural stone. Its understated appearance and hardy temper are unique. It is a stone which leaves nobody unmoved. The Hainan black and grey basalt, counghfghfgterpart of the Italian basaltina and the Australian bluestone, is our area of expertise.asalt is a very distinctive natural stone. Its understated appearance and hardy temper are unique. It is a stone which leaves nobody unmoved. The Hainan black and grey basalt, counterpart of the Italian basaltina and the Australian bluestone, is our area of expertise.