#0004 Round Black Synthetic Gemstone Nanostial
Made through a patented crystallization process of silica (SiO2) and alumina (Al2O3), this gemstone features a hardness of 7 on the Mohs scale, ensuring excellent durability for everyday jewelry wear. Its refractive index of 1.65–1.7 and specific gravity of 3.5–4 provide optical characteristics very similar to valuable natural stones like sapphire and topaz. Unlike cubic zirconia, Nanosital exhibits a natural, subtle luster without an overly strong shine, maintaining an attractive play of colors. It is free from harmful contaminants such as lead and cadmium, making it safe and environmentally friendly. With a high melting point of 1700°C, Black Nanosital is ideal for lost-wax casting, offering consistent color, total transparency, and no internal defects, making it a perfect choice for sophisticated, durable black gemstone jewelry.