ComputerGear Science Jewelry Necklace DNA Molecule Double Helix Biology STEM Look beautiful and smart with DNA Double Helix Necklace Silver-plated charm on 18" silver-plate necklace DNA necklace makes an exceptional STEM science gift from our science jewelry collection Matching DNA earings also available Unique sciecne jewelry earrings are a ComputerGear exclusive You can return this item for any reason and get a full refund: no shipping charges. The item must be returned in new and unused condition. Go to Your Orders to start the return Print the return shipping label Ship it!