Sterling Silver Ornate Celtic Knot Amethyst Necklace; 18 Inches Long Made of .925 solid sterling silver with amethyst gemstone Measures approximately 2 inches (5.08 cm) wide by 1/2 inches (1.27 cm) tall Single sided Chain measures 18 inches (45.7 cm) with two additional rings that allow it to be adjusted down to 16 inches