I know: drink beer, walk, go up things like towers and hills, eat meat, drink beer, walk up and down all streets not being too preoccupied with anything as mundane as shops for example.
Well, I am proposing a cure for all that aimless walking and climbing.
O.k. so my birthstone (July) is ruby, but I like garnets. So far, I've sent him the above photos, addresses to reputable shops and an article about counterfeit stones.
There is also some lovely crystal in Prague.
That should keep him busy.