** Shares in Pandora PNDORA.CO rise 8% as the choice of the next U.S. Fed chair set off a wave of selling in risk assets that sent precious metals, the Danish jeweller's key material silver among them, tumbling for a second session
** Gold XAU= slid 9% to its lowest in more than two weeks, while silver XAG= fell more than 13%, after both metals hit record highs last week
** Gold prices tumbled by more than 7% on Friday, dragging other metals lower, and sent Pandora's shares up 5%
** For Pandora, best known for its charm bracelets, silver is the most used raw material and made up around 68% of the product materials sourced, according to the company's latest sustainability report
(Reporting by Elviira Luoma)
((Elviira.luoma@thomsonruters.com))