Amberina glass ranges in shades of light to dark red and sometimes fuchsia at the top to shades of light to darker amber at the bottom, or visa-versa in which case it is called reverse Amberina. It is created by mixing a compound including gold in the glass and reheating the object before it completely cools. The major producer of Amberina in the U.S. was the New England Glass Company, Toledo, Ohio, who patented the process in 1883 and thus prevented competitors from making glass without a license. It's successor, the Libbey Glass Company made the glass in the 1890's.
This lovely Amberina tumbler is an inverted diamond pattern. Nice shading of deep red to amber with a polished pontil. The tumbler measures 3 3/4" in height and 2 5/8" across the top. Colors are darker than shown in the photos. There are no cracks chips or repairs.