Natural Stone Exquisite Tourmaline Ring Size approx.: 12mm*12.8mm*Thickness 6.2mm; Ring Size: Adjustable free size. Recommended for free size rings: ● Those unsure of their ring size, "I don't know my ring size clearly..." ● Those whose rings become tight due to swelling at night Metal Material: s925 silver, s925 stamp; With a pouch, product number A3560; Tourmaline has slightly different vibrations depending on the color of the stone, and the direction in which it exerts its power differs, but basically, it is said to help the wearer to blossom their inherent abilities and human charm, amplify positive energy, and support them in shining in their own way. Tourmaline has various colors, and another major characteristic. The crystals of this stone are columnar, but the properties of both ends are different, positive and negative, and this causes them to become charged (electrified). Similar properties are also seen in quartz, but tourmaline has this property more strongly, and in Japanese, it is called "electric stone." Tourmaline itself does not generate electricity or conduct electricity. If left alone, it is just a stone, but when rubbed (friction) or heated, it becomes charged and is said to generate static electricity (negative ions). Therefore, if you want to take advantage of this property of tourmaline, we recommend wearing it as a necklace that directly touches the skin. All stones used have been purified. ■ Due to the shooting environment, the color of the photo may look slightly different from the actual product. Instant purchase OK. Thank you!