By the turn of the century, Morgan had become one of America's most important collectors of gems and had assembled the most important gem collection in the U.S. as well as of American gemstones (over 1,000 pieces).
到世纪之交，摩根已成为美国最重要的宝石收藏家之一，收集了美国最重要的宝石收藏，以及最重要的美国宝石（超过1000件）。