Magic Metal THC Molecule Necklace Gold Tone Tetrahydrocannabinol Cannabis Structure Pendant NY02 Fashion Jewelry Ships from the USA Tetrahydrocannabinol THC Molecular Structure Necklace. Pendant Length: 2 inches to 1 inch. Length of Chain, Open from Clasp to End: 21 inches Makes a perfect gift. Search Magic Metal Jewelry for more jewelry styles.