Terahertz Heart Necklace Terahertz: Approximately 25.8mm x 19mm Cord: Adjustable. Can be adjusted up to approximately 66cm [Terahertz] Terahertz ore is an artificially created mineral made by melting quartz at high temperatures and collecting silicon. The one trillion vibrations per second (terahertz waves) emitted by terahertz ore penetrate various substances such as wood and plastic. Also, because of its high thermal conductivity, when applied to ice, the vibrations plus the heat conduction from the hand cause the ice to melt quickly. It is said to have effects such as promoting blood flow and enhancing natural healing ability, and is widely used in medical and industrial fields. Not only is it attracting attention for its positive effects on beauty and health, such as cell activation, improved blood flow, and skin firmness, It is also popular as a "scientifically effective power stone."