Natural stone tourmaline ring size approximately: 10mm*14.5mm*4mm thick; Ring size: Adjustable free size. Free size rings are recommended for people who: ● Are unsure about ring size, "I don't know my ring size..." ● Find rings tight due to swelling at night Metal material: s925 silver plated with K14 rose gold; s925 stamp present. Weight approximately: 2g, comes with a bag, product number A2336; 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 another major characteristic in addition to its various colors. The crystals of this stone are columnar, but the properties of both ends are different, positive and negative, which causes them to become charged (electrified). Similar properties can be seen in quartz, but tourmaline has this property more strongly, and it is called "electric stone" in Japanese. Tourmaline itself does not generate electricity or conduct electricity. If left alone, it is just a stone, but it is said that when rubbed (friction) or heated, it becomes charged and generates 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. ■ The color of the photo may look slightly different from the actual product depending on the shooting environment. Instant purchase OK. Thank you!