Feature:. Obsidian is a common black gemstone. Obsidian is a naturally occurring volcanic glass that is produced when the feldspar lava that has been extruded from the volcano rapidly cools and crystals grow minimally. Obsidian in which the chemical composition (high silica content) causes high viscosity and polymerization of lava. It is sometimes called the "stone of truth" because it encourages the expression of secrets and hidden emotions. Superb manual art-craft, strong and durable workmanship,highly hand polished ,wear comfortable. This pendant necklace is a great gift for Birthday, Father's festival, Mother's festival, Business gifts,Tourism souvenir ect. Material: Obsidian Gemstone. Color:Black, Size: Pendant:5 x 5 for cm/2"x 2" Chain Length: adjustable45-90cm/18"-35" Quantity: 1 Pc Note: Size for manual measurement, there may be a 0 to 2 for cm error, belongs to the normal phenomenon. And due to the difference between different monitors, the picture may not reflect the actual color of the item. Thank you! Package includes: 1 Pc x Necklace.