A pair of blue-glazed bowls from the Yongzheng period [Photo/ english.cguardian.com/]

Sky blue glaze wares mainly appeared during the three periods of the Qing Dynasty. Those from Yongzheng’s period were even more expertly manufactured than the other two. This pair of sky blue glazed bowls are simple and delicately shaped and sold for 1,840,000 RMB at the 28th China Guardian Quarterly Auctions. They are nearly 300 years old but are perfectly preserved.