Terahertz Stone Beads Strands, Faceted, Column, Size: about 16~18mm long, 11~12mm in diameter, hole: 2mm; about 20pcs/strand, 16.7 inch.Terahertz is a man-made gemstone that is invented by Japanese scientists in order to protect the body against electromagnetic smog and harmful radiation. What's more, it's an artificial stone called silicon, but terahertz stone has stronger prowess.
