Men’s onyx, lava stone and hematite bracelet

Stone(s): onyx, lava stone and hematite Thread type: durable elastic cord Wrist size: 16cm to 18cm Color: black and metallic gray Weight: 18.6 g Photos not contractual Stone diameter: approx. 5 to 6mm Stone cut: cabochon Shape: square Classification: Onyx: quartzite group – Lava stone: igneous rocks – Hematite: hematite group Mohs hardness: Onyx: 7 – Lava stone: 5 to 5.5 – Hematite: 5.5-6.5 Density: Onyx: 2.5-2.6 – Lava stone: 1.2T:m3 – Hematite: 4.9-5.3 Origin: Onyx: Italy, Mexico, Brazil, United States, South Africa, Russia – Lava stone: all countries with volcanic activity Hematite: Brazil, U.S.A, Spain, England, Germany Care instructions: Onyx, lava stone and hematite are not fragile. No specific care required. However, to preserve the elastic, avoid getting the bracelet wet.