Astrological Cancer Amulet Double Lucky Donuts Green Serpentine Quartz Pendant Necklace Best Amulets Collection. Astrological Cancer Amulet Double Lucky Donuts Green Serpentine and Rock Crystal Quartz Gemstones Zodiac Pendant NecklaceAstrological Cancer Amulet Double Lucky Donuts Green Serpentine Quartz Pendant Necklace Pendant Size: 30mm (1 1/4"), Larger Donut is 30 mm and Smaller Donut is 20mm. Only Gemstones are used and may have natural specks and inclusions making your Amulet Unique. Ready to wear with Adjustable Cotton Waxed Cord, Shortest 15 inch and longest 24 inch.