Star Ruby The tree has a bushy appearance and the cambium cells (the layer between the  bark and wood) is red.  The fruit peel is yellow with a reddish tinge and a distinct red blushes, with color development beginning in mid-summer.  The peel is smooth and thin and the flesh and juice are a deep red color, much more so than the Ruby.  The flesh is firmer than the Ruby and better suited for sectioning. It has 0 to 9 seeds.