Semjase is 344 years old, about 1.7 meters (5.5 ft.) tall and is a slender, young, pretty woman with fair skin, sparkling blue eyes and light-blond hair. Her very long and somewhat forward-placed earlobes form a special distinguishing feature. This is the only anatomical difference compared to our women here on earth. Due to her exceptional knowledge, which far exceeds the average of her home population, she has assumed the rank of half-Jschrjsch, which means a half-queen of wisdom or a half-goddess, as they were called earlier on earth (and which can be read about, for example, in Greek legends). Having occupied herself with various matters on our planet years before taking up contact with Billy Meier on January 28, 1975, she is by far the best-oriented extraterrestrial concerning our situation on earth. During the period from February of 1965 until June of 1973, she stayed in the DAL-universe with Asket's people. After her return from the DAL-universe to Erra, she came to earth in July of 1973 and continued to carry out the task she had performed here earlier in a hidden station. The First Contact with Billy occurred on January 28, 1975. Of all the earth languages, she only mastered German and learned no others. In November of 1984, Semjase finally had to leave the earth for health reasons. Her field of work was exclusively restricted to the European area. She had no authorization whatsoever to become involved in any matters of, or establish contact with, any Pleiadian work groups on earth outside of Europe (neither in America nor Asia)

Unfortunately, on December 15, 1977, she suffered a life-threatening accident in the Semjase Silver Star Center in Hinterschmidrüti and had to be taken to her home planet of Erra immediately for medical treatment and rehabilitation. In May of 1978, she returned to earth and resumed her contacts with Billy until March 26, 1981. From March of 1981 until the end of January 1984, she was again absent because there were other duties she had to fulfill. On February 3, 1984, the very last contact took place between Semjase and Billy. As an after-effect of her accident on December 15, 1977, she suffered a cerebral collapse in the beginning of November 1984 and was transported again as quickly as possible to the DAL-universe where she was healed by the help of Asket and her friends, the Sonaer. Her father, Ptaah, explained that the complete regeneration of her brain and all psi-powers, abilities and memories lost during her collapse would presumably take about seventy years. During this period, Semjase will spend most of her time in the DAL-universe, and it should be noted here that it is absolutely impossible for Semjase to communicate by mechanical or telepathic means with anyone here in our universe. (The only way one could communicate would be to travel to the DAL-universe oneself.) On a personal note, Semjase was married but tragically lost her husband after she had been wed for only seven years. Her spouse had participated in a research expedition in a foreign galaxy. At that time, approximately 200 years ago, they did not know the hyperspace technology yet. Of the two research ships dispatched, only one returned home after eleven years, whereas the other with her husband aboard suffered control damage and crashed into a sun. Her marriage was without children.