BestAmulets Amulet Yin Yang BA GUA Eight Trigrams Magic and Crystal Quartz Pendant Necklace Best Amulets Collection. Amulet Yin Yang BA GUA Eight Trigrams Magic and Protection Powers Crystal Quartz Medallion Circle Pendant NecklaceAmulet Yin Yang BA GUA Eight Trigrams Magic and Crystal Quartz Pendant Necklace Natural Grade A+/A- Crystal Rock Quartz Gemstone. May or will have natural specks and inclusions. Amulet Medallion SIZE: 35mm (1  inches in diameter) and 8mm Thick. All Art Work is Engraved on top of the Gemstone. No Ink is used on Crystal Quartz 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