Silestone: 25-year warranty Silestone surfaces offer unique advantages and properties in terms of aesthetics, functionality and technical features. For this reason, Silestone provides a 25-year warranty. Activate your warranty Requirements for completing the Silestone warranty form 1. Provide your invoice/proof of purchase. 2. Register the warranty on the website within 6 months from the date of purchase of the product. Any product that has not been registered within a period of 6 months from the date of purchase will be covered by a 2-year warranty if the invoice is submitted. Letter of Warranty 25-year warranty for Silestone Download your Letter of Warranty – only applicable to those products that are sold and registered after 1 January 2015. 10-year warranty Download your Letter of Warranty – only applicable to those products that are sold and registered between 1 July 2009 and 31 December 2014.