She looks great, and the pearls are gorgeous. But if I was an athlete I would not be wearing any jewelry while playing, or anything that would add weight to my body, bounce around, or cause wind or water resistance. Plus, I don't like to sweat on my jewelry.
How pretty! Maybe Emma Raducanu will do for pearls what Chris Evert did for diamond “Tennis” bracelets. I noticed a lot of the Olympic swimmers were wearing pearl studs during their events. A little easier on the ears than those big gorgeous dangles.