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 call 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 who patented the process in 1883 and thus prevented competitors from making the glass without a license. It's successor the Libbey Glass Company made the glass into the 1890's.
This lovely Amberina tumbler is the inverted baby thumbprint pattern. Nice shading of red to amber. The tumbler measures 3 7/8" in height and 2 1/2" across the top. Colors are darker than shown in the photos. There are no cracks, chips or repairs.