A coffee fruit develops from the flower. This fruit is 1.5 cm round and initially green. As it matures, its color changes to red. It is the red colored fruits that are used in coffee production. Coffee fruits need to be checked very regularly because they start to rot within 14 days of ripening. Inside the thick-skinned fruit there are usually two green beans. These beans are used to make coffee. Some coffee trees produce one bean instead of two. This bean (peaberry) has a much rounder shape than the others. The single beans are separated from the others and put through a production process. The beans are flat on the side facing each other and round on the outside. Inside each bean is a seed (coffee embryo) of the same shape. On the flat surface of the bean there is a deep line filled with a hard fattening tissue. The outer layer of the nutrient tissue is covered by a thin membrane. Outside the membrane is a harder shell. If the coffee bean is later used as a seed, the bean is not separated from the shell.