The file photo taken during the auction house's preview in Hong Kong, China on May 4, 2016 shows the 5.03-carat "Aurora Green" Fancy Vivid Green diamond ring, the largest such vivid green diamond in the world. [Photo/Agencies]

HONG KONG - A green diamond sold for $16.8 million at a Hong Kong auction on Tuesday, setting two world records, Christie's said.

At 5.03 carats, the rectangular-cut "Aurora Green" had been valued at $16 million to $20 million.

Although it sold at the lower end of that range, it set a "world auction record for a green diamond and world record price per carat for a green diamond", Christie's said.

The "fancy vivid green" diamond was among a variety of offerings at Christie's "Magnificent Jewels" spring sale in Hong Kong.