Babylon SilverSolid 925 Sterling Silver Onyx Stone Turkish Handmade Luxury Arrow Design Ring for Men

Im buying this for my guy. His ring size is a 9, do i buy a 9? There seems to be confussion on ring size in the comments?

Is this ring available in size 11? The drop-down menu doesn't show 11.

Is this pure silver?

Would this work as a pinky ring?