The Trial of the Pyx (/pɪks/) is a judicial ceremony in the United Kingdom to ensure that newly minted coins from the Royal Mint conform to their required dimensional and fineness specifications. Although coin quality is now tested throughout the year under laboratory conditions, the event has become an annual historic tradition. In 2017, a total of 35,000 coins were put on trial, consisting of both those struck for circulation and non-circulating commemorative coins.