The Buffalo Bills left Houston with an L, but the players didn't go empty-handed ... 'cause some of the team's biggest stars went on a huge jewelry shopping spree before the game!!
TMZ Sports has learned ... about 20 Bills players, including guys like Ed Oliver, Vincent Taylor, Cody Ford and Jordan Phillips, hit up celeb jeweler Iceman Nick for some awesome team bonding on Friday (the day before their game against the Texans).
We're told the players were so excited to go check out the store, they went over as soon as they checked into their team hotels.