To help ensure that you are buying authentic crystals from Swarovski, the Swarovski seal comprises the latest security features.Apart from its hologram effect, every seal has a unique identification number that can be found directly below the seal on the front of the tag or sticker on which the seal is applied. The 16-digit code identifies the brands that are using genuine Swarovski crystals in their finished products, providing proof of the origin and premium quality of the crystals used. To establish the authenticity of the Swarovski seal tag or sticker, you can verify the tracking number on their website: www.swarovski.com/crystals