My son needs to buy his GF a diamond engagement ring. I was in NYC recently and browsed 47th Street for him. He is meeting me in NYC next month to shop for a ring in his price range. I am his moral support. I am going to Amsterdam in September, so I could purchase a ring on his behalf while there, given that I know what he is looking for from the NYC trip (and by taking photos and emailing them for his approval). Where do you think we would be likely to get the most bang for his buck? NYC or Amsterdam? Neither he nor I know much at all about buying diamonds. Help!