Yellow gold graduation / mother's / bust lyre Gorgeous 14K yellow gold graduation pin now at a great price! It has a diameter of 16mm, which is the official size. On the back you will find a brooch pin to attach the lyrna. What is a matriculation / maternity lyre? In Finland, the matriculation lyre is usually given by a new matriculation student before the graduation ceremony as a tribute to his mother for her upbringing and other care. The mother who has received the lyre can wear it not only at her own child's graduation but also when she attends the graduation of others or at important family celebrations. In general, the mother has one lyres for each child she has graduated, usually all worn at the same time. The mother's lyre is attached to the left, or heart side, while the usual brooches are worn on the right side.