Team Logo. The Lethbridge Black Diamonds were a team in the Pioneer League. They were the Rookie affiliate of the Arizona Diamondbacks. In 1999 they moved to Montana and became the Missoula Osprey. Retrieved from "https://prosportsteams.fandom.com/wiki/Lethbridge_Black_Diamonds?oldid=16899" Categories: Former PL Teams Teams in Alberta Teams in Lethbridge Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.