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 the glass without a license. It's successor, the Libbey Glass Company made the glass into the 1890's.
This lovely pair of Amberina tumblers are the inverted thumbprint pattern. Nice shading of red to amber, about evenly divided between the two colors. The tumblers measures 3 3/4" in height and 2 5/8" across the top. Quite evenly matched in color and weight. Colors are darker than shown in the photos. There are no cracks, chips or repairs.