Silestone: 25-year warranty Silestone surfaces offer unique advantages and properties in terms of aesthetics, functionality, and technical features. Backed by 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 purchase date. 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 Silestone is backed by a 25-year warranty Download your Letter of Warranty – only applicable to those products that are sold and registered after January 1, 2015. 10-year warranty Download your Letter of Warranty – only applicable to those products that are sold and registered between July 1, 2009 and December 31, 2014.