Best Place to buy non-designer Platinum Rings?

Salam everyone,

I’m looking to buy non-designer platinum rings in Saudi. I’ve had great experience with gold but i’m having a difficult time with platinum. I’d prefer leads in Riyadh or even Qassim compared to like Jeddah or Dammam. Help a gal out guys, much appreciated.

It’s for someone who lives in Europe so i’d like authenticity to be great as well as the workmanship. Thank youu.