Pakistani jewelry company Winza will make the debut of a 10-carat unheated Kashmir sapphire at this year's expo, while Belgian brand Tache will display a 14.37-carat internally-flawless yellow diamond, according to Donghao Lansheng Group, organizer of the diamond and gems pavilion at the expo. 

It has announced that the pavilion's exhibition area will be expanded from 10,000 square meters to 20,000 square meters, setting an all-time record in the expo's history. 

A total of 189 enterprises from 33 countries and regions will take part in the jewelry exhibition. The exhibitors will promote new ruby, sapphire, emerald, pearl, jade, amber products and other rare treasures at the exhibition, the group said. The organizers have issued guidelines for overseas exhibitors and participants attending the upcoming third expo. 

These inbound travelers must obey a 14-day self-health monitoring prior to their departure for China. Upon their arrival in the country, all of them need to make a health declaration, have their temperature taken, and go through nucleic acid tests. Anyone found with a fever or cough will be sent by ambulance on site to designated hospitals for health screening and treatment. All such exhibitors and exhibition participants will be subject to a 14-days quarantine at designated hotels, and will undergo nucleic acid tests two more times on the fifth and 12th day, respectively, during their quarantine periods.