CIR 55mm (UK size O), China

I had a similar ring when I was a teenager, it was one of my favorite.  It has a “pure silver” mark in Chinese (but as a human guinea pig I can verify that it is really pure silver as I suffer badly with metal allergy, only pure gold and silver would pass the test, how posh is that!)

Enamel was brought into China from France in the Qing dynasty (17th century) and was immediately adored by Emperor; workshops for the court were set up in Imperial Court in Beijing and in Guangdong.  It then became popular throughout the country during the reign of the next 2 emperors.  The type of enamel produced in China was mainly cloisonne, where a thin wire is applied to form cells to hold the enamel.