Many surviving historic thumbrings are hardstone carvings in jade and other gemstones, or are made of precious metal. Most are very practical but some have the release surface so ornamented as to be unusable. The rings could be displayed on a cord from the belt, or, in China, in a special box. In the 16th century court of the Ottoman Empire they had the extra function of being "used when executing disgraced officials to tighten a handkerchief wound round the throat".