BestAmulets Amulet Magical Pentacle Runic Star Powerful Defense Energies Black Agate Pendant Necklace Best Amulets Collection. Amulet Magical Pentacle Runic Star Powerful Defense Protection Energies Black Agate Medallion Circle Pendant NecklaceAmulet Magical Pentacle Runic Star Powerful Defense Energies Black Agate Pendant Necklace Natural Grade A+ Black Agate Gemstone. Amulet Medallion SIZE: 35mm (1  inches in diameter) and 8mm Thick. All Art Work is Engraved on top of the Gemstone. Metallic Color Ink is used on Black Agate Medallions. Ready to wear with Cotton Waxed Cord which Adjusts from 15 up to 24 inches long and you may wear it any length you desire