The amberina glass color is characterized by yellow glass in the center of a piece, gradually blending to a red at the outer edge. The process was hard to attain, so you will see differences in the effect. For example, the bowl on the left, a Fenton Little Flowers, has a rather abrupt transition from yellow to red, while the Stag and Holly bowl has a fairly dark yellow on the feet with a very gradual blend to the reddish-yellow at the outer edges. Amberina is a very desirable color. The Little Flowers bowl sold for $1,300 in 1998, another for $1,050 in 2013; the Stag and Holly for $1,800 in 1999 and another for 900 in 2013.