Crunchy Diva Designs Exclusive Organic Casting Collection Crunchy Diva Designs used the casting method to make our exclusive Organic Collection of unique and unusual pendants found in nature. This fossilized sting ray tail was found in Florida and is up to 24 million years old. Choose from oxidized brass, oxidized sterling silver, or oxidized 24kt gold. Total length 3 1/4". Each pair comes with an informational card and a cloth bag for safe keeping.