The phrase "priceless jewels" refers to extremely valuable and precious gemstones or jewelry that cannot be assigned a specific monetary value because they are considered so rare and valuable. Full definition
(1) Indeed, the earliest stories of his life and deeds were probably told because of the sayings they enshrined and illustrated — they were the simple settings for priceless jewels. (religion-online.org)
Even as the rest of the world struggled to find their next meal these actresses dripped in priceless jewels. (petiteover40.com)
To pull off their scheme, Debbie and Lou assemble the mysterious hacker Nine Ball (Rihanna), jewelry expert Amita (Mindy Kaling), pickpocket Constance (Awkwafina), fashion designer Rose (Helena Bonham Carter), and old associate - turned - housewife Tammy (Sarah Paulson) to help them rob priceless jewels right off the neck of Daphne Kluger (Anne Hathaway). (slashfilm.com)