Как и обещала, копирую сюда ответ от Тиффани. Специально для Лампады. Надеюсь,  не будет утверждать, что я это все придумала. Здесь и про 30 дней для возврата, и потемнение серебра, и официальный сайт. Все просто прекрасно! On behalf of Tiffany & Co., please accept my apologies for the circumstances that prompted you to write us. I can understand your disappointment.Our return policy is within 30 days of the purchase that you may submit for return. Tiffany & Co.'s sterling silver is of highest quality compared to industry standards at 92.5% pure. Sterling silver is a precious metal and does tarnish naturally. Sterling silver that is regularly used or worn requires less care. Therefore, Tiffany & Co. encourages you to wear your silver often.Tarnishing is typically at a surface level and can be easily removed. Use a small amount of Tiffany's silver jewelry cleaner on a soft cloth, and gently rub the silver several times. Then rinse the silver thoroughly in warm water and carefully dry. This will remove tarnish and dullness, keeping your sterling silver like new. *Please note: chlorine and bleach accelerate tarnishing and should be avoided.We are more than happy to send you a sterling silver polishing cloth or polishing solution, so you can bring your pendant back to life. If you are interested in purchasing a polishing product, please feel free to reach out to our representatives at the phone number listed below.If you are interested in a professional cleaning, please follow one of the steps below. Related tax would also apply. You may bring your item to the Tiffany store nearest you, or send in your item via mail. If you choose to send your item via mail, please follow the instructions listed below:1. Download our Service Request Form.2. Print form and complete all information..3. Enclose form with item to be serviced..4. Send item and form, via an insured shipping method, to:TCOCustomer Service Department75-20 Astoria Boulevard, Third FloorEast Elmhurst, NY 11370If you would prefer to purchase a polishing product, please contact one of our representatives at 1-800-843-3269.Sincerely,Noura ElbassiounyTiffany & Co.Phone: 800 843 3269Email: customerservice@tiffany.comPlease visit us at www.Tiffany.com