COS Set of 3 DNA Double Helix Science Molecule Necklace - Gold, Silver, and Rose Gold Plated Includes all 3 Necklaces! (Silver, Gold, and Rose Gold) Pendant Size: 1 1/8" x 1/8" Each with an 18 Inch Chain with Lobster Claw Clasp Arrives in a Gift Bag MONEY BACK GUARANTEE - Clayton Jewelry offers a 100% money back guarantee if you don't love it!