The two ceramic vases purchased from a London savings store for £20 ($255) date back to the 18th Thanh Dynasty and can be sold for up to £50,000 ($62,700) - CNN reported.
The pair of "doucai" bottles of lotus and chamomile of the Chinese royal family will be auctioned at Roseberys in London, UK on May 16.
Doucai (shaped cut) is a Chinese porcelain decoration technique in which the parts of the decorative motifs and some outer provinces of the rest are painted with blue under the paint, then painted and grated.
Bill Forrest - deputy director and head of the art department of China, Japan and Southeast Asia at Roseberys - said that the doucai technique began to be used in the 15th century during the early Ming Dynasty.
Forrest said that Chinese royal ambassadors are often produced extremely carefully, very rarely and infrequently, only for the royal court.
The vases are delicately painted with enzyme, 11.5 cm in diameter, painted with blooming chrysanthemums and curved lotus leaves, with layers of red, yellow and vivid green enzyme and the layers below are blue.
Although the prototype for this special design has not been found, the pattern is found on bowls excavated from the min date mines.
Forrest said the sellers of the vases were pottery collectors. They saw these items in a savings store last year and knew they had to buy them without knowing their value.
Forrest said: I think anyone who is in front of the Chinese royal pottery, no matter how experienced they are, will feel attracted to some extent.
Only when the seller researched the words found at the bottom of one of the bottles - "Can Long" - did they realize the potential meaning of porcelain. After that, they brought the items to the auction house for inspection.
Can Long was the fourth emperor of the Qing Dynasty for six decades.
Dishes with similar designs have been sold in previous auctions. A pair of covers was sold at Sotheby's London for £277,200 (about $347,000) in November 2021.
