No reserve price Tourmaline - 11.22 ct - Antwerp Laboratory for Gemstone Testing (ALGT)

Tourmaline is a complex boron silicate mineral known for its broad color spectrum and wide variety of crystal forms. The 11.22-carat tourmaline specimen assessed by the Antwerp Laboratory for Gemstone Testing (ALGT) underlines the gem's appeal in the jewelry and collector markets. Tourmaline can appear in nearly every color, including multicolored specimens where zones of different hues coexist, making each stone unique. The mineral's piezoelectric and pyroelectric properties have also made it a subject of scientific interest. Commonly found in igneous and metamorphic rocks, tourmaline's robust hardness of about 7 to 7.5 on the Mohs scale makes it suitable for many types of jewelry. Its diverse color varieties, like the popular watermelon and paraiba tourmalines, offer a rich palette for designers and collectors alike.