Amulet Ancient Tibetan Mantra OM Mani Padme Hum Black Agate Protection Pendant Necklace Best Amulets Collection. Amulet Ancient Tibetan Mantra OM Mani Padme Hum Good Luck Charm Black Agate Spiritual Protection Hand Carved Pendant NecklaceAmulet Ancient Tibetan Mantra OM Mani Padme Hum Black Agate Protection Pendant Necklace Amulet Size: 38mm X 23mm X 5mm (About 1 1/2 inches long). Ready to Wear with Adjustable Cotton Waxed Cord which adjusts from 15 up to 24 inches long. Each Amulet is Handcrafted and No Two Pieces are ever the same being Carved by Hand. Each Amulet comes with Individual Velvet Pouch and Information Card.